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Readme: remove alpha channels section

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mara0004 2021-10-03 11:50:15 +00:00
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@ -77,14 +77,6 @@ Bugs
files with other colorspaces, you must explicitly specify it using the
`--colorspace` option.
- Input images with alpha channels are not allowed. PDF only supports
transparency using binary masks but is unable to store 8-bit transparency
information as part of the image itself. But img2pdf will always be lossless
and thus, input images must not carry transparency information. You can
remove the alpha channel for example with imagemagick:
convert input.png -background white -alpha remove -alpha off output.png
- An error is produced if the input image is broken. This commonly happens if
the input image has an invalid EXIF Orientation value of zero. Even though
only nine different values from 1 to 9 are permitted, Anroid phones and