Legacy ImageMagick Discussions Archive

windows, here is my final script,

for /f %x in ('dir /s /b talk*.png') do @convert -alpha extract %x %x-mask.png
mogrify -flatten talk*.png
for /f %x in ('dir /s /b talk*.png') do @composite -compose CopyOpacity %x-mask.png %x %x

works, end result here,
http://www.botlibre.com/avatar?id=1115544

Doh, okay I figured it out. My images were good, but I somehow have two different versions of ffmpeg on my computer and was using the wrong one that doesn't seem to support transparency.

Now it is working.

My only issue is the last shell line,

for /f %x in ('dir /s /b blink*.png') do @composite ...

If I use "identify -verbose" and compare the original image, with the converted one, the alpha difference is,

original (that gives transparent webm) - Alpha: none #00000000
converted (that is white background) - Alpha: srgba(255,255,255,0) #FFFFFF00

So, how do I make the Alpha - none #00000000
?

Not sure how it worked the first time. But I was trying a lot of things, maybe somehow used another step the first time to get a good video. Please help.

Ok what I came up with was using a shell for command,

for /f %x in ('dir /s /b blink*.png') do @composite -compose CopyOpacity mask-0.png %x %x

But for some reason when I convert from the png series to a webm video using ffmpeg now it does not include the alpha channel. It does from the original ...

Does anyone know how to batch convert 60 files with the above three steps? (extract mask, flatten, compose mask with flattened image)
Just the last step I can't figure out.

Great, I got it to work, but still need to be able to do it simpler,

convert -alpha extract *.png mask.png
mogrify -flatten blink*.png
composite -compose CopyOpacity mask-0.png blink00.png good.png

Mask the final video good,
http://www.botlibre.com/media/a1159578.webm

but there are 60 files ...

Thanks but it makes it worse, it looses part of the edges.

http://www.botlibre.com/media/a1156752.webm

http://www.botlibre.com/media/a1156753.png

I tried 1% as well, then it looses some image, and gets a halo...

The flatten image and video looks good, it just is missing the alpha. Is there any ...

Here is one with the right extension,

http://www.botlibre.com/media/a1153704.png

Oops, actually the file is a png, the file extension is wrong. You can save it using .png it does have the alpha transparency.

The source images are a png image series, all like,

http://www.botlibre.com/avatars/a1153644.jpg

The issue is the background color used to render the image was black but with a transparent alpha.
Flatten overlays a white background with the png image with transparency, so the black becomes white ...

Thanks, that works, but I get a weird halo around the image. My guess is there are semi transparent pixls.

With,

> mogrify -background white *.png

> mogrify -alpha Background *.png

I get this webm, which looks good in Chrome, but has a halo in Firefox

http://www.botlibre.com/media/a1153572.webm ...

I'm trying to convert a png image series with a transparent background to an mpeg and webm video.
The transparent background shows as black in the video but I want it to be white.

I know I can convert the background to white using,

mogrify -flatten *.png

But I want to preserve the transparency ...