mirror of https://github.com/CrimsonTome/tldr.git
29 lines
1.2 KiB
Markdown
29 lines
1.2 KiB
Markdown
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# pnmpsnr
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> Compute the difference between two images.
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> More information: <https://netpbm.sourceforge.net/doc/pnmpsnr.html>.
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- Compute the difference, i.e. the peak signal-to-noise ratio (PSNR) between two images:
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`pnmpsnr {{path/to/file1.pnm}} {{path/to/file2.pnm}}`
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- Compare the color components rather than the luminance and chrominance components of the images:
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`pnmpsnr {{path/to/file1.pnm}} {{path/to/file2.pnm}} -rgb`
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- Run in comparison mode, i.e. only output `nomatch` or `match` depending on whether the computing PSNR exceeds `n` or not:
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`pnmpsnr {{path/to/file1.pnm}} {{path/to/file2.pnm}} -target {{n}}`
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- Run in comparison mode and compare the individual image components, i.e. Y, Cb, and Cr, to the corresponding thresholds:
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`pnmpsnr {{path/to/file1.pnm}} {{path/to/file2.pnm}} -target1 {{threshold_Y}} -target2 {{threshold_Cb}} -target3 {{threshold_Cr}}`
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- Run in comparison mode and compare the individual image components, i.e. red, green, and blue to the corresponding thresholds:
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`pnmpsnr {{path/to/file1.pnm}} {{path/to/file2.pnm}} -rgb -target1 {{threshold_red}} -target2 {{threshold_green}} -target3 {{threshold_blue}}`
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- Produce machine-readable output:
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`pnmpsnr {{path/to/file1.pnm}} {{path/to/file2.pnm}} -machine`
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