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issue-13921: Support setting compression setting for writing tiff images

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This commit is contained in:
Rajkiran Natarajan 2019-03-09 15:48:21 -05:00
parent d8b58205be
commit 40af53b1d6
2 changed files with 5 additions and 5 deletions
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7
modules/imgcodecs/include/opencv2/imgcodecs.hpp
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@ -92,9 +92,10 @@ enum ImwriteFlags {
IMWRITE_EXR_TYPE = (3 << 4) + 0, /* 48 */ //!< override EXR storage type (FLOAT (FP32) is default)
IMWRITE_WEBP_QUALITY = 64, //!< For WEBP, it can be a quality from 1 to 100 (the higher is the better). By default (without any parameter) and for quality above 100 the lossless compression is used.
IMWRITE_PAM_TUPLETYPE = 128,//!< For PAM, sets the TUPLETYPE field to the corresponding string value that is defined for the format
IMWRITE_TIFF_RESUNIT = 256,//!< For TIFF, use to specify which DPI resolution unit to set; see libtiff documentation for valid values
IMWRITE_TIFF_XDPI = 257,//!< For TIFF, use to specify the X direction DPI
IMWRITE_TIFF_YDPI = 258 //!< For TIFF, use to specify the Y direction DPI
IMWRITE_TIFF_RESUNIT = 256,//!< For TIFF, use to specify which DPI resolution unit to set; see libtiff documentation for valid values.
IMWRITE_TIFF_XDPI = 257,//!< For TIFF, use to specify the X direction DPI.
IMWRITE_TIFF_YDPI = 258, //!< For TIFF, use to specify the Y direction DPI.
IMWRITE_TIFF_COMPRESSION = 259 //!< For TIFF, use to specify the image compression scheme. See libtiff for integer constants corresponding to compression formats. Note, for images whose depth is CV_32F, only libtiff's SGILOG compression scheme is used. For other supported depths, the compression scheme can be specified by this flag; LZW compression is the default.
};
enum ImwriteEXRTypeFlags {

3
modules/imgcodecs/src/grfmt_tiff.cpp
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@ -750,12 +750,11 @@ bool TiffEncoder::writeLibTiff( const std::vector<Mat>& img_vec, const std::vect
}
//Settings that matter to all images
// defaults for now, maybe base them on params in the future
int compression = COMPRESSION_LZW;
int predictor = PREDICTOR_HORIZONTAL;
int resUnit = -1, dpiX = -1, dpiY = -1;
readParam(params, TIFFTAG_COMPRESSION, compression);
readParam(params, IMWRITE_TIFF_COMPRESSION, compression);
readParam(params, TIFFTAG_PREDICTOR, predictor);
readParam(params, IMWRITE_TIFF_RESUNIT, resUnit);
readParam(params, IMWRITE_TIFF_XDPI, dpiX);