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Better chroma subsampling explanation and correct

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Beep6581
2015-10-29 22:43:49 +01:00
parent d7009c9b6a
commit 7ba4a8f471
31 changed files with 37 additions and 34 deletions
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11
rtgui/main.cc
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@@ -567,10 +567,13 @@ int processLineParams( int argc, char **argv )
std::cout << " Preferences > Image Processing > Default Processing Profile" << std::endl;
std::cout << " -j[1-100] Specify output to be JPEG (on by default). Optionally add" << std::endl;
std::cout << " compression 1-100 (default value: 92)." << std::endl;
std::cout << " -js<1-3> Specify the JPEG subsampling parameter, where:" << std::endl;
std::cout << " 1 = Best compression: 2x2, 1x1, 1x1 (4:1:1) - default of the JPEG library" << std::endl;
std::cout << " 2 = Widely used normal ratio: 2x1, 1x1, 1x1 (4:2:2)" << std::endl;
std::cout << " 3 = Best quality: 1x1, 1x1, 1x1 (4:4:4)" << std::endl;
std::cout << " -js<1-3> Specify the JPEG chroma subsampling parameter, where:" << std::endl;
std::cout << " 1 = Best compression: 2x2, 1x1, 1x1 (4:2:0)" << std::endl;
std::cout << " Chroma halved vertically and horizontally." << std::endl;
std::cout << " 2 = Balanced: 2x1, 1x1, 1x1 (4:2:2)" << std::endl;
std::cout << " Chroma halved horizontally." << std::endl;
std::cout << " 3 = Best quality: 1x1, 1x1, 1x1 (4:4:4)" << std::endl;
std::cout << " No chroma subsampling." << std::endl;
std::cout << " -b<8|16> Specify bit depth per channel (only applies to TIFF and PNG output)." << std::endl;
std::cout << " -t[z] Specify output to be TIFF (16-bit if -b8 is not set)." << std::endl;
std::cout << " Uncompressed by default, or ZIP compression with 'z'" << std::endl;