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Merge pull request #6730 from sturkmen72:patch-16

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This commit is contained in:
Alexander Alekhin 2016-06-28 05:36:15 +00:00
commit 02edfc8df2
2 changed files with 6 additions and 5 deletions
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2
modules/imgcodecs/include/opencv2/imgcodecs.hpp
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@ -84,7 +84,7 @@ enum ImwriteFlags {
IMWRITE_JPEG_RST_INTERVAL = 4, //!< JPEG restart interval, 0 - 65535, default is 0 - no restart.
IMWRITE_JPEG_LUMA_QUALITY = 5, //!< Separate luma quality level, 0 - 100, default is 0 - don't use.
IMWRITE_JPEG_CHROMA_QUALITY = 6, //!< Separate chroma quality level, 0 - 100, default is 0 - don't use.
IMWRITE_PNG_COMPRESSION = 16, //!< For PNG, it can be the compression level from 0 to 9. A higher value means a smaller size and longer compression time. Default value is 3.
IMWRITE_PNG_COMPRESSION = 16, //!< For PNG, it can be the compression level from 0 to 9. A higher value means a smaller size and longer compression time. Default value is 3. Also strategy is changed to IMWRITE_PNG_STRATEGY_DEFAULT (Z_DEFAULT_STRATEGY).
IMWRITE_PNG_STRATEGY = 17, //!< One of cv::ImwritePNGFlags, default is IMWRITE_PNG_STRATEGY_DEFAULT.
IMWRITE_PNG_BILEVEL = 18, //!< Binary level PNG, 0 or 1, default is 0.
IMWRITE_PXM_BINARY = 32, //!< For PPM, PGM, or PBM, it can be a binary format flag, 0 or 1. Default value is 1.

9
modules/imgcodecs/src/grfmt_png.cpp
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@ -370,22 +370,23 @@ bool PngEncoder::write( const Mat& img, const std::vector<int>& params )
}
int compression_level = -1; // Invalid value to allow setting 0-9 as valid
int compression_strategy = Z_RLE; // Default strategy
int compression_strategy = IMWRITE_PNG_STRATEGY_RLE; // Default strategy
bool isBilevel = false;
for( size_t i = 0; i < params.size(); i += 2 )
{
if( params[i] == CV_IMWRITE_PNG_COMPRESSION )
if( params[i] == IMWRITE_PNG_COMPRESSION )
{
compression_strategy = IMWRITE_PNG_STRATEGY_DEFAULT; // Default strategy
compression_level = params[i+1];
compression_level = MIN(MAX(compression_level, 0), Z_BEST_COMPRESSION);
}
if( params[i] == CV_IMWRITE_PNG_STRATEGY )
if( params[i] == IMWRITE_PNG_STRATEGY )
{
compression_strategy = params[i+1];
compression_strategy = MIN(MAX(compression_strategy, 0), Z_FIXED);
}
if( params[i] == CV_IMWRITE_PNG_BILEVEL )
if( params[i] == IMWRITE_PNG_BILEVEL )
{
isBilevel = params[i+1] != 0;
}