PNG Transparency Issue

[Matthew Richer]

My first email didn't seem to come through:



I have extracted a bunch frames into PNG named according to:



if < 10 frame-1.png up to frame-9.png (basically %d).

If < 100 frame-01.png up to frame-99.png (basically %2d)

If < 1000 frame-001.png up to frame-999.png (basically %3d)

Etc.



These images I'm seeing has some sort of transparency setting on it (see
link for frame-1.png). I want to kill the transparency and get a white
background.



convert frame-1.png frame-1.jpg -- no good, goes black(ish).

convert frame-1.png -alpha off frame-1.jpg - same as above - see
frame-1-bad.jpg.

convert frame-1.png -alpha background frame-1.jpg - ya! It works (still a
little grainy around the lettering)



Now I need to do it in batch.



mogrify -format jpg -alpha background *.png



Now I need to also thumbnail them.



mogrify -format jpg -alpha background -thumbnail 90x90 *.png - oh, oh this
reverted back to the blackish thing.

mogrify -format jpg -thumbnail 90x90 -alpha background *.png - kinda works
but the black smudges are still there.



Thoughts? Basically I think the PNG has some sort of transparency without
using alpha channel, anyway I can get a 'normal' alpha channel they will
just drop to white when I go to PNG?



Links:



frame-1.png - Loading Image...

frame-1.jpg - Loading Image...

frame-1-bad.jpg - Loading Image...





Thanks!

Matt

[Fred Weinhaus]

try


convert image.png -background white -flatten result.jpg

Post by Matthew Richer
I want to kill the transparency and get a white
background.