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Specifying quality changes PNG file format to ISO Media #68

@kbrandwijk

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@kbrandwijk

Using sharp-cli@2.1.0:

❯ file logo.png
logo.png: PNG image data, 512 x 512, 8-bit/color RGBA, non-interlaced

❯ npx sharp-cli -i ./logo.png -o ./logo_opt.png
/.../logo_opt.png

❯ file logo_opt.png
logo_opt.png: PNG image data, 512 x 512, 8-bit/color RGBA, non-interlaced

❯ file logo_opt.png
logo_opt.png: PNG image data, 512 x 512, 8-bit/color RGBA, non-interlaced

❯ npx sharp-cli -i ./logo.png -o ./logo_opt80.png --quality 80
/.../logo_opt80.png

❯ file logo_opt80.png
logo_opt80.png: ISO Media

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