Black JPEG Bug

[fmw42]

Anthony,

Does this mean that one should do:

convert image -alpha flatten -alpha off result

to get the opaque alpha channel turned off or is that already included in the -alpha flatten. You comments were a bit unclear to me.

Fred

[cur53se]

So I've tried all options provided here, including flatter alpha remove etc.. but nothing works when converting pdf to jpg

convert -density 72 foo.pdf -background white -flatten bar.jpg
convert -density 72 foo.pdf -alpha flatten bar.jpg
convert -density 72 foo.pdf -alpha off flatten bar.jpg
convert -density 72 foo.pdf -alpha remove flatten bar.jpg

ImageMagick 6.7.7-10 2012-06-29 Q16 on Debian 6

[snibgo]

That is a very old version. I suggest you upgrade. If you still have problems, post a link to the file.

[anthony]

no such thing as -alpha flatten.

See IM Examples, Masking and Channels, Alpha Channel Handling
http://www.imagemagick.org/Usage/masking/#alpha

For a complete example set on removing transparency, before saving to JPEG see the next major section...
Removing Transparency from Images
http://www.imagemagick.org/Usage/masking/#remove