History of Changes

Version 3.15 (30/Jul/2020)

• New: functions imCompressDataLZ4 and imCompressDataUnLZ4.
• Changed: Removed im_lzo library and LZO replaced by LZ4.
• Changed: FFTW is now an external library.

Version 3.14 (18/May/2020)

• New: functions imProcessRenderOpAlpha and imProcessRenderCondOpAlpha.
• New: function imProcessBinThinZhangSuen.
• New: function imProcessThresholdSaturation.
• Changed: imProcessRenderConstant and imProcessRenderFloodFill now supports alpha channel.
• Changed: imProcessBinMorphThin renamed to imProcessBinThinNhMaps.
• Changed: libjasper updated to version 2.0.14. But we lost support for GeoJasper. It is still possible to compile using older version.
• Changed: libjpeg updated to version 9d. Changes in libjpeg are not necessary anymore. Any libjpeg distribution can also be used.
• Changed: libexif updated to version 0.6.21.
• Changed: libtiff updated to version 4.1.0. Changes in libTIFF can be ignored and another libtiff distribution can be used.
• Changed: libpng updated to version 1.6.37.
• Fixed: kernel check for im.ProcessGrayMorphConvolve and im.ProcessBinMorphConvolve in Lua.
• Fixed: IM_ALPHA support in imImageCreate

Version 3.13 (07/Jan/2019)

• New: functions imProcessBinaryMask, imProcessSelectHue, imProcessSelectHSI, imProcessLensDistort, imProcessQuantizeGrayMedianCut, imProcessQuantizeRGBMedianCut, imProcessThresholdColor, imProcessShiftComponent, imProcessFixBGR, imProcessPseudoColor, imProcessBackSub.
• Changed: added counter support for processing functions imProcessInterlaceSplit, imProcessFlip, imProcessMirror, imProcessRotate180, imProcessRotate90, imProcessReduceBy4, imProcessCrop, imProcessInsert, imProcessAddMargins, imProcessZeroCrossing, imProcessBinMorphThin, imProcessCanny, imAnalyzeFindRegions,  imAnalyzeFindRegions, imAnalyzeMeasureArea, imAnalyzeMeasureCentroid, imAnalyzeMeasurePrincipalAxis, imAnalyzeMeasureHoles, imAnalyzeMeasurePerimeter, imAnalyzeMeasurePerimArea, imProcessPerimeterLine, imProcessRemoveByArea, imProcessFillHoles, imCalcRMSError, imCalcSNR, imCalcPercentMinMax, imCalcHistoImageStatistics, imCalcHistogramStatistics, imCalcImageStatistics, imCalcCountColors, imCalcGrayHistogram, imCalcHistogram
• Changed: imAnalyzeFindRegions function changed to return the counter state and region_count is now a parameter.
• Changed: from float to double in the API of functions imColorRGB2HSI, imColorHSI2RGB, imVideoCaptureGetAttribute, imVideoCaptureSetAttribute, imImageSetAlpha, imConvertDataType, imConvertToBitmap, and all imProcess* functions that have a float parameter.
• Changed: im_ffft3 that uses FFTW3 is now also included in the distribution and uses float and double support.
• Changed: hue palette last color to be also red.
• Changed: imPaletteCian renamed to imPaletteCyan.
• Changed: added suppot for IM_GRAY in imProcessRenderFloodFill.
• Fixed: palette copy in imImageCopyAttributes.
• Fixed: support for multiple counters nested or not.
• Fixed: counter in imConvertDataType and imConvertColorSpace.
• Fixed: imCalcHistogram for IM_SHORT and IM_USHORT data types.
• Fixed: imPaletteLinear some invalid colors.
• Fixed: added support for IM_DOUBLE in imProcessMergeHSI and imProcessSplitHSI. And fixed conversion.
• Fixed: maximum number of formats in imVideoCapture.
• Fixed: invalid memory access in imProcessBlend.

Version 3.12 (30/Sep/2016)

• New: imDibSectionFromImage utility.
• Fixed: imDibCreateSection and support for alpha channel in imDibToImage and imDibFromImage.

Version 3.11 (20/Jun/2016)

• New: USE_LUA_VERSION variable for the Lua binding Makefiles to simplify the build for different Lua versions.
• Changed: libTIFF updated to version 4.0.6
• Changed: libPNG updated to version 1.6.23. libPNG code is now used only in Windows. In Linux it uses the libpng installed on the system.
• Changed: zlib updated to version 1.2.8. zlib source code is now separated from the main svn. Is still inside IM svn but in a separate folder. In Linux it uses the zlib installed on the system.

Version 3.10 (15/Sep/2015)

• New: header "im_plus.h" with the first version of the C++ API.
• New: ifile:GetAttributeRaw in Lua to retrieve an attribute as an userdata.
• New: function imProcessRenderFloodFill.
• Changed: removed include "im_old.h" from "im.h", must be manually included by old applications. Notice that the old API will be removed in future versions.
• Changed: Lua pre-compiled binaries are now separated by folders Lua51/Lua52/Lua53.
• Changed: imAnalyzeMeasurePerimArea and imAnalyzeMeasureHoles to include region_count parameter.
• Fixed: checking of real and complex image data types in some im.Processing functions in Lua.
• Fixed: imImageRemoveAlpha memory allocation.
• Fixed: removed luaL_register dependency from Lua >= 5.2 bindings.
• Fixed: imProcessNormalizeComponents

Version 3.9.1 (27/Apr/2015)

• New: support for Lua 5.3.
• New: im.Close() function available from Lua to avoid memory leaks.
• Fixed: invalid TIFF file when saving bitmap images.

Version 3.9 (30/Sep/2014)

• New: function imImageLoadFromResource only in Windows.
• New: imCompressDataLZO and imCompressDataUnLZO for data compression/decompression using libLZO in an external library called im_lzo because libLZO is GPL.
• New: "image:SetPixels(table)" and "table = image:GetPixels()" member functions in Lua.
• New: "PFM" internal file format (Portable FloatMap Image Format).
• New: utility functions imImageSetAttribInteger, imImageSetAttribReal, imImageSetAttribString, imImageGetAttribInteger, imImageGetAttribReal, imImageGetAttribString, imFileSetAttribInteger, imFileSetAttribReal, imFileSetAttribString, imFileGetAttribInteger, imFileGetAttribReal, imFileGetAttribString.
• New: data types IM_DOUBLE and IM_CDOUBLE. All functions that process IM_FLOAT will also process IM_DOUBLE.
• New: function imProcessMultipleMedian.
• Changed: IMPORTANT - the following attributes changed from IM_FLOAT to IM_DOUBLE in TIFF format (StoNits, GeoTiePoints, GeoTransformationMatrix, "Intergraph TransformationMatrix", GeoPixelScale, GeoDoubleParams).
• Changed: TIFF format when saving IM_BINARY images in one of the CCITT are now saved as WhiteIsZero (image data is inverted before saving as well). This was necessary because some applications were ignoring the PhotometricInterpretation tag in favor of the CCITT compression.
• Changed: libTIFF updated to version 4.0.3.
• Changed: interpolation order is now optional in Lua. Defaults to 0 for IM_MAP and IM_BINARY, or 1 for other color spaces.
• Changed: definitions of imMultiPointColorOpFunc and imMultiPointOpFunc to include image count and depth.
• Changed: repository migrated from CVS to SVN.
• Fixed: added compatibility code for libPNG 1.2.
• Fixed: alpha processing in some operations to check for alpha on both source and target.

Version 3.8.2 (21/Nov/2013)

Version 3.8.1 (26/Nov/2012)

Version 3.8 (15/May/2012)

Version 3.7 (02/Jan/2012)

• New: function imImageMergeAttributes.
• New: function imProcessNormDiffRatio.
• New: function imProcessSetAlphaColor.
• New: function imCalcPercentMinMax.
• New: function imProcessShiftHSI.
• New: function imProcessCalcAutoGamma.
• New: functions imProcessUnaryPointColorOp, imProcessUnaryPointOp, imProcessMultiPointOp and imProcessMultiPointColorOp.
• New: functions imImageSetMap and imImageSetGray.
• New: support for OpenMP in the im_process library. Almost all image processing functions now have support for multi-thread using OpenMP. Since multi-threading can be slower than single thread depending on the conditions, there are two libraries one called "im_process" and one called "im_process_omp". New function imOpenMPSetMinCount to be used to control the OpenMP loop. New functions imProcessConvertDataType, imProcessConvertColorSpace imProcessConvertToBitmap equivalent to imConvertDataType, imConvertColorSpace imConvertToBitmap but with support for OpenMP.
• New: image enhance utilities for in-place operation in Lua, including image:AutoLevel(), image:Equalize(), image:Negative(), image:Level(), image:BrightnessContrast(), and image:Gamma().
• New: function imFormatInfoExtra.
• New: support for Lua 5.2.
• Changed: imImageInit now accepts also the IM_ALPHA flag.
• Changed: imProcessThreshold, imProcessSliceThreshold, imProcessMinMaxThreshold and imProcessThresholdByDiff now supports also IM_FLOAT images.
• Changed: imProcessEqualizeHistogram, imProcessExpandHistogram, imCalcGrayHistogram, imCalcCountColors, imCalcHistogramStatistics and imCalcHistoImageStatistics now also supports data type IM_USHORT.
• Changed: removed Lua bytecode usage in pre-compiled binaries. Now IM pre-compiled binaries are compatible with LuaJIT.
• Changed: third party libraries updated to newest versions zlib 1.2.5, libpng 1.5.7, libjpeg 8c  and libtiff 4.0.
• Changed: IMPORTANT - zlib library separated from the main IM library. Now the application that statically link with IM must also link to zlib. If Tecmake is used, and USE_IM=Yes, then no changes are necessary.
• Fixed: support for alpha with gray images in SGI format.
• Fixed: imProcessMultipleMean when source images were data type byte.
• Fixed: im.ProcessAddMargins in Lua to accept sizes greater or equal than the source size.
• Fixed: im.ProcessUniformErrThreshold, im.ProcessMinMaxThreshold and im.ProcessPercentThreshold return value in Lua.
• Fixed: invalid memory access when loading TIFF files with custom tags using double precision values.
• Fixed: internal precision of imCalcImageStatistics.
• Fixed: computation order of IM_BIN_SUB in imProcessArithmeticOp and in imProcessArithmeticConstOp, was computing b-a instead of a-b.
• Fixed: im.CalcHistogram in Lua when data type is IM_USHORT.
• Fixed: loading RGB images with non byte data type, when data planes in file are packed.
• Fixed: memory leaks when parameter test fails in functions that receive an array in Lua.
• Fixed: loading of DNG (TIFF) files.

Version 3.6.3 (09/Nov/2010)

• New: function imImageCreateFromOpenGLData.
• Changed: the function imConvertPacking now has one more parameter so src_depth can be different from dst_depth.
• Fixed: imImageGetOpenGLData for some configurations.
• Fixed: write support for alpha in TGA format. (Thanks to Nicolas Noble)

Version 3.6.2 (22/Jun/2010)

• New: function imVideoCaptureReleaseDevices.
• Changed: ICON format now supports writing up to 10 images.
• Changed: replaced old "arg" usage for "..." to improve better compatibility with LuaJIT.
• Changed: control of LOHs inclusion moved from the source code to the makefile.
• Changed: removed compatibility with require"imlua51", now LuaBinaries must be used or LUA_CPATH must be set.
• Changed: added compatibility with Lua 5.2.
• Fixed: image:HasAlpha() method in Lua was returning a number instead of a boolean, so im.ImageCreateBased was adding an alpha channel to all new images.

Version 3.6.1 (23/Apr/2010)

• Fixed: invalid memory access in imProcessResize when one dimension is equal to the original.
• Fixed: imProcessCompose parameter parsing in Lua.
• Fixed: invalid memory access when saving an image with the JPEG 2000 format.

Version 3.6 (26/Jan/2010)

• New: function imImageCopyPlane.
• New: function imProcessCompose.
• New: function imImageSetAlpha.
• Changed: libTIFF downgraded to version 3.8.2 because of the JPEG support in TIFF not working on the newer versions.
• Changed: included alpha support in imProcessSplitComponents and imProcessMergeComponents. Included alpha support in all geometric and size operations.
• Fixed: invalid memory access in imAnalyzeFindRegions when more than 16k regions where found.
• Fixed: memory leak in imFileOpen.
• Fixed: alpha support in image:CopyPlane() and in channel indexing in Lua.
• Fixed: incomplete initialization of the array in imAnalyzeMeasureArea.
• Fixed: imProcessRemoveByArea inside/outside logic.

Version 3.5 (02/Oct/2009)

• New: functions imProcessUnsharp and imProcessSharp.
• New: function imImageGetOpenGLData.
• New: functions im.ConvertDataTypeNew, im.ConvertColorSpaceNew and im.ConvertToBitmapNew in Lua.
• New: file attributes "FileFormat", "FileCompression" and "FileImageCount" when reading from file. Available for all formats.
• New: ASCII compression for RAW format to access text data instead of binary.
• Changed: libPNG updated to version 1.2.39. Removed changes to the library that made it incompatible with other libPNG distributions.
• Changed: libLZF updated to version 3.5.
• Changed: libJPEG updated to version 7.
• Changed: libEXIF updated to version 0.6.17.
• Changed: libTIFF updated to version 3.9.1.
• Changed: library im_fftw3 to use an external library.
• Changed: imImageCreateBased and imConvertColorSpace now also consider the alpha plane.
• Changed: imProcessPrune renamed to imProcessRemoveByArea, and added a new parameter to select inside or outside the interval.
• Changed: removed IM_UN_INC operation from imProcessUnArithmeticOp. It was not an unary operation. Can simply be done in place by imProcessArithmeticOp and IM_BIN_ADD.
• Changed: now imProcessUnArithmeticOp, imProcessArithmeticConstOp and imProcessArithmeticOp willl crop the result to 0-255 if target has data type byte.
• Fixed: PNG attribute TransparencyIndex. new PNG attribute TransparencyMap. TransparentColor renamed to TransparencyColor.
• Fixed: invalid convertion from MAP to GRAY when loading imImages.
• Fixed: new image size computation of im.ProcessCropNew in Lua. 
• Fixed: loading of RAW data.
• Fixed: imImageClear to initialize data just like imImageCreate does.
• Fixed: imImageReshape when the image has an alpha plane. Image is not cleared anymore.
• Fixed: boolean parameters in file:ReadImageData, im.ConvertDataType, im.ConvertToBitmap, im.ProcessSplitComplex, im.ProcessQuantizeRGBUniform, im.ProcessBitPlane, im.ProcessRotateRef, im.ProcessRotate90, im.ProcessBinMorphConvolve, im.ProcessMergeComplex, im.CalcHistogram, im.CalcGrayHistogram and im.AnalyzeFindRegions in Lua. Changed im.Capture* functions to use boolean values in Lua.
• Fixed: RAW format initialization.

Version 3.4.2 (26/Jun/2009)

• Changed: removed "lua5.1.so" dependency in UNIX.
• Fixed: AVI format when reading 32 and 16 bpp frames.
• Fixed: xmin and ymin check in im.ProcessCrop and in im.ProcessInsert in Lua.

Version 3.4.1 (15/Dec/2008)

• Changed: function imColorHSI_Smax removed from public, now it is used only internally. HSI space now uses S already normalized between 0-Smax.
• Fixed: imColorHSI2RGB conversion.
• Fixed: imConvertDataType when converting a floating point to integer, there were rounding problems.
• Fixed: loading and saving two or more files of the same format at the same time.

Version 3.4 (14/Oct/2008)

• New: imlua_avi, imlua_wmv and imlua_jp2 libraries so the respective formats can be dynamically loaded using require.
• Changed: IMPORTANT - the "imlua_cd" library moved from IM to CD under the name "cdluaim".
• Changed: IMPORTANT - the support services (Downloads, Mailing List and CVS) moved from LuaForge to SourceForge.
• Changed: All dll8 and dll9 DLLs now have a Manifest file that specifies the correct MSVCR*.DLL.
• Changed: Makefiles for UNIX now uses a compact version of Tecmake that does not need any installation, just type "make".
• Changed: premake files are used now only internally and were removed from the distribution.
• Changed: Copyright notice modified to reflect the registration at INPI (National Institute of Intellectual Property in Brazil). License continues under the same terms.
• Fixed: reviewed and fixed the parameter checking of all IMLua processing functions. Also reviewed all IMLua parameter checking. Thanks to Lucas Lorensi.
• Fixed: loading of TIFF format with old JPEG compression.
• Fixed: loading and saving of PNM format when data in textual format and gray values are greatter than 255.
• Fixed: Bicubic and Zero order interpolation for all geometric operations for pixels near the image border when increasing image size.
• Fixed: Lua samples.
• Fixed: ICON format in 64 bits Linux.

Version 3.3 (26/Nov/2007)

• New: read support for ECW using the ERMapper ECW JPEG 2000 SDK.
• Changed: libTIFF updated to version 3.8.2.
• Changed: libPNG updated to version 1.2.22.
• Changed: libJasper updated to libGeoJasper 1.4.0 (using Jasper version 1.900.1). Better support for counter progress, Geo tags and several speed improvements. New GeoTIFFBox and XMLPacket attributes.
• Changed: renamed macro imPutImage to imcdCanvasPutImage, and added canvas as the first parameter.
• Changed: renamed the imImage Lua methods to image:cdCanvasPutImageRect, image:wdCanvasPutImageRect and image:cdCanvasGetImage, and added canvas as the first parameter. Now imlua_cd depends on cdlua from CD version 5.0.
• Changed: metatable names in Lua are now the same as the C struct names.
• Changed: new read EXIF tags support in TIFF format (no write support yet). Renamed attributes "GeoTransMatrix" and "IntergraphMatrix", to "GeoTransformationMatrix" and "Intergraph TransformationMatrix" for libGeoTIFF compatibility. Better support for known TIFF tags. New support for reading one band of a multiband gray image in TIFF format. New support for DNG files.
• Fixed: imConvertDataType gamma function when converting real to/from integer.
• Fixed: small error at the image border when resampling, rotating or other geometric operations.
• Fixed: imProcessCanny invalid division by zero when input image is all zero.
• Fixed: imFileReadImageInfo when loading MAP images with a scrambled gray palette. They were incorrectly converted to GREY.
• Fixed: support for IM_ALPHA and 32 bpp in ICO format.
• Fixed: number of lines returned in imProcessHoughLinesDraw.

Version 3.2 (24/Nov/2006)

• New: imProcessRotateRef to rotate relative to a reference point.
• New: geometric distortion imProcessSwirl.
• New: imProcessInterlaceSplit.
• New: function imGaussianKernelSize2StdDev.
• New: convolutions imProcessBarlettConvolve, imProcessPrewittConvolve, imProcessSplineEdgeConvolve, imProcessConvolveDual and imProcessConvolveSep.
• New: "im_kernel.h" module with simple functions to create know pre-defined kernels like sobel, laplacian, gaussian, etc.
• New: imVideoCaptureSetInOut to control input and output in capture devices.
• New: function imBinMemoryRelease to release internal memory allocated by the BinMemory file when saving.
• New: functions for capture device information: imVideoCaptureDeviceExDesc, imVideoCaptureDevicePath and imVideoCaptureDeviceVendorInfo.
• New: function imFileOpenAs to open a file of a specific format.
• New: functions imFormatRegisterInternal and imFormatRemoveAll to control format registration.
• Changed: imProcessGaussianConvolve to used separable convolution and now is stddev is negative will use its magnitude as the kernel size. Removed Rep functions imProcessGaussianConvolveRep, imProcessDiffOfGaussianConvolveRep and imGaussianStdDev2Repetitions.
• Changed: imProcessBlend to use an image instead of a constant. Old function renamed to imProcessBlendConst.
• Changed: imFileHandle prototype. Now the function has an index parameter to specify which handle it should return. index=0 is always an imBinFile* handle. Use index=1 or greater to return other internal handles that are format dependent.
• Changed: the Removed the include "im.h" to not include "im_lib.h". "im_lib.h" must be included when necessary.
• Changed: imAnalyzeMeasureArea and imAnalyzeMeasurePerimeter prototypes to include the number of regions as a parameter. Fixed: these functions to internally initialize the results array to zero (this was necessary and not documented).
• Changed: imProcessFlip and imProcessMirror so they can be done in-place.
• Fixed: missing implementation of imVideoCaptureOneFrame in Lua 5.
• Fixed: imAnalyzeFindRegions when pixel is at the width-1 column.
• Fixed: file format identification when TIFF identification failed was not closing the file.
• Fixed: imAnalyzeMeasurePerimeter when perimeter line is at the first or last lines. Thanks to Takeshi Mitsunaga.
• Fixed: invalid return value in imVideoCaptureConnect in Lua 5.
• Fixed: imProcessRotate for IM_MAP images.
• Fixed: Lua binding of imFileImageSave, wrong parameters order. New: image:Save(filename, format) alias for imImage objects.
• Fixed: BMP format implementation when reading and writing RGBA 32 bits images.
• Fixed: imFileLoadImageFrame and imFileLoadBitmapFrame index parameter in Lua.
• Fixed: alpha channel allocation in imImage.

Version 3.1 (12/Dez/2005)

• New: Download, Discussion List, Submission of Bugs, Support Requests and Feature Requests, are now available thanks to the LuaForge site.
• New: Binding for Lua 5
• New: support for alpha in imImage.
• New: organization of the documentation.
• New: in ICON format the TransparencyIndex is used to for IM_MAP images without an alpha channel.
• New: video capture functions: imVideoCaptureFormatCount, imVideoCaptureGetFormat and imVideoCaptureSetFormat, to access the available capture video formats.
• New: functions imFileLoadImageFrame and imFileLoadBitmapFrame to reuse the image data when loading.
• New: function imFileImageSave.
• New: function imImageCreateBased.
• New: imProcessInsert.
• New: compression functions imCompressDataLZF and imCompressDataUnLZF, using libLZF.
• New: module for imBinFile, IM_FILEHANDLE that allows to access an already opened file using the system file handle as file name. Thanks to Frederico Abraham.
• Changed: in JPEG file format YcbCr are now automatically converted to RGB when loaded. RGB images were already automatically converted to YCbCr when saved. Now this behavior can be controlled by the AutoYCbCr attribute.
• Changed: the imAnalyzeFindRegions to include an additional parameter that control if regions touching the border are computed or not. The function imProcessPrune now will only eliminate the regions in the selected size range.
• Changed: third party libraries updated to newest versions: libExif, libTIFF, libPNG and zlib. Added OLD JPEG support in libTIFF.
• Changed: optimization flags to ON when building the library in all platforms.
• Changed: imProcessPerimeterLine, imAnalyzeMeasurePerimeter, imAnalyzeMeasurePerimArea, imAnalyzeMeasureCentroid and imAnalyzeMeasurePrincipalAxis to consider pixels that touch the borders.
• Changed: macro name cdPutBitmap to imPutBitmap.
• Changed: function names imImageLoad and imImageLoadBitmap, to imFileImageLoad and imFileImageLoadBitmap.
• Fixed: overflow in imCalcImageStatistics fo IM_INT and IM_USHORT images.
• Fixed: error management in system file I/O in UNIX.
• Fixed: some small defines for 64-bits compatibility in libExif, libPNG and libJPEG.
• Fixed: incorrect interpretation of 16 bit data from PNG files.
• Fixed: imFileReadImageInfo can be called many times with the same index that will return the correct result without accessing the file again.
• Fixed: small bug in sample iupglcap.
• Fixed: TIFF format read for images with multiple bands in ExtraSamples.
• Fixed: ICON format can_sequence was 0.
• Fixed: imProcessMergeHSI and imProcessSplitHSI documentation, and implementation for IM_BYTE images.
• Fixed: imProcessRangeContrastThreshold, imProcessLocalMaxThreshold and imProcessRankClosestConvolve when processing near the border.
• Fixed: invalid file permissions in UNIX when saving a new file.
• Fixed: name for imProcessLocalMaxThresEstimate.
• Fixed: imProcessReduceBy4 for images with odd width and/or height.
• Fixed: imAttribTableSet when replacing an attribute (thanks to Takeshi Mitsunaga).
• Fixed: memory leaks in imConvertToBitmap and imConvertDataType (thanks to Takeshi Mitsunaga).
• Fixed: imProcessZeroCrossing for the last pixel column (thanks to Takeshi Mitsunaga). Also fixed for some crossings that were lost.
• Fixed: imProcessGrayMorphConvolve for IM_FLOAT images with IM_FLOAT kernel (thanks to Takeshi Mitsunaga).

Version 3.0.3 (14/Oct/2004)

• New: Image Transform imProcessDistanceTransform.
• New: group of functions Image Analysis: imAnalyzeFindRegions, imAnalyzeMeasureArea, imAnalyzeMeasurePerimArea, imAnalyzeMeasureCentroid, imAnalyzeMeasurePrincipalAxis, imAnalyzeMeasureHoles, imProcessPerimeterLine, imAnalyzeMeasurePerimeter, imProcessPrune, imProcessFillHoles.
• New: imConvertMapToRGB to help loading data as RGB.
• New: sample iupglcap.
• New: imProcessRenderChessboard and imProcessRenderGrid.
• Changed: imProcessThreshold, imProcessRangeContrastThreshold and imProcessLocalMaxThreshold now also supports IM_USHORT and IM_INT data types.
• Changed: the default color conversion to binary so it can be done for all color spaces.
• Changed: im_process.h to split into 4 files: im_process_pont.h, im_process_loc.h, im_process_glo.h, im_process_ana.h. But it still exists and includes the new files for compatibility.
• Changed: the border extensions in several types of convolution. Rank convolution do not extend the borders. Binary morphology use zero extension. Gray morphology do not extend the borders.
• Fixed: file read with bitmap conversion when original data changes only data type.
• Fixed: rank convolution operations that did not accept even kernel sizes.
• Fixed: imProcessHoughLinesDraw that was ignoring some lines.

Version 3.0.2 (25/Aug/2004)

- New: utility functions imPaletteHighContrast, imImageLoadImage and imImageLoadBitmap.
- New: operation imProcessNormalizeComponents.
- Changed: name imProcessGaussianConvolve to imProcessGaussianConvolveRep. New: operation imProcessGaussianConvolve that uses a float kernel. New: utility functions imGaussianStdDev2Repetitions and imGaussianStdDev2KernelSize.
- Changed: name imProcessDiffOfGaussianConvolve to imProcessDiffOfGaussianConvolveRep. New: operation imProcessDiffOfGaussianConvolve that uses a float kernel.
- Changed: IM_GAMUT_BRIGHTCONT parameters to the interval [-100,100]. Fixed: IM_GAMUT_EXPAND and IM_GAMUT_BRIGHTCONT normalization.
- Changed: logical operations, flag IM_BIT_NOT replaced by operation imProcessBitwiseNot.
- Changed: imImageSetAttribute count can be -1 for zero terminated data.
- Fixed: operations imProcessBitwiseNot and imProcessNegative for IM_BINARY images.
- Fixed: the color_mode_flags parameter interpretation by imFileReadImageData.
- Fixed: imProcessEqualizeHistogram and imProcessExpandHistogram for color images.
- Fixed: imProcessMultipleStdDev.
- Fixed: imProcessDifusionErrThreshold for IM_GRAY images.
- Fixed: "KRN" format, internal format is topdown.
- Fixed: initialization of TGA image_count.

Version 3.0.1 (22/Apr/2004)

- Improved compatibility with the old version, it was missing the load of Map images with imLoadRGB.
- The FFTW code was from version 2.1.3, not from 2.1.5 as suposed, it was updated. The FFT functions were condensed in only one file with an "#ifdef" for FFTW version 2 and 3. The FFT functions also were renamed to remove the "W" that belongs only to the FFTW library.
- The SetAttribute functions now accept NULL in data to remove the attribute.
- New: imProcessCrossCorrelation and imProcessAutoCorrelation functions.
- The imCalcGrayHistogram function now can calculate the histogram of IM_MAP and IM_BINARY images.

Version 3.0 (April 2004)

A major rewrite of the library. Everything changed, check the manual, but backward compatibility is kept for old applications. A new API more flexible, new formats, support for attributes and video, image capture and image processing. New: color spaces and data types. The library now got a professional look for scientific applications.

Version 2.6 (May 2002)

Correction of bug in resolution reading and writing for format JPEG.

Version 2.5 (August 2001)

Correction of bug in the default GIF compression. Two new callbacks: transparency color index for GIF files and image description for TIFF files.

Version 2.4 (February 2000)

Change in the treatment of LZW compression in formats TIFF and GIF. Now compression is no longer the default.

Version 2.3 (June 1998)

Close function of the access driver for files in memory corrected. JPEG library updated to 6b. Correction of a problem with the reading of some JPEG files.

Version 2.2 (November 1997)

The definition of the counter callback was changed to inform, in a parameter, the type of access being performed, either reading or writing. Type imCallback defined to make type casting easier when using function imRegisterCallback. Correction of a problem with the makefile in UNIX, which was generating link errors in some platforms.

Version 2.1 (October 1997)

Correction of a problem with internal memory liberation when reading Map images in TIFF files. Conversion RGB to Map is now made using the algorithm implemented by LibJPEG. The algorithm of imResize was improved for cases in which the size is being reduced instead of increased. Correction of a problem with functions imImageInfo and imFileFormat: when the provided file was not in a format recognized by IM, there was an error in format TGA which caused these functions to access an invalid memory area.

Version 2.0 (September 1997)

The library was virtually rewritten to implement a new structure which allowed greater flexibility, simplifying the addition of new formats. Formats TGA, PCL, JPEG and LED were added to the list of supported formats, and new functions were added: imMap2RGB, imRGB2Gray, imMap2Gray, imResize, imStretch.

Version 1.1 (June 1996)

Small corrections to increase portability. Changes in return codes. Identifiers were created to return codes and predefined parameters. Online manual concluded.

Version 1.0 (October 1995)