Legacy ImageMagick Discussions Archive

you can extract any layer/frame you want using the [n] syntax for frame n.
gets the first frame

or
converts all frames as image_1.gif, image_2.gif, etc

If your frames are not transparent already, then you will need to process them while or after extracting them. I am not sure what parts you want transparent or if you want them to be completely transparent everywhere. You will need to clarify that further.

Hi there

I'm extracting the frames from the gif as mentioned but in my case, i have a real problem with the quality.

My original gif is:
http://www.livesystems.ch/media/animated.gif

This gif has 4 frames but only the first one is extracted okey. for example the second one looks like this:
http://www.livesystems.ch/media/out_1.gif

has anyone any idae why my convert does not function? i tried serveral things:

convert animated.gif out_%d.gif

convert animated.gif[1] test2.jpg

mogrify -sharpen 0x1 -format gif/jpg/png out.gif

thank you for your help

animated gifs are often stored as partial updates in each frame. So the get the full frame of each you need to use -coalesce to extract them

convert animate.gif -coalesce animate_%d.gif

Then you can process each frame individually.

see http://www.imagemagick.org/Usage/anim_basics/#coalesce

Looks more like JPEG compression artifacts to me!!!!!

the thing with coalesce worked perfectly for me. thank you for your help!

fmw42 wrote:animated gifs are often stored as partial updates in each frame. So the get the full frame of each you need to use -coalesce to extract them

convert animate.gif -coalesce animate_%d.gif

Then you can process each frame individually.

see http://www.imagemagick.org/Usage/anim_basics/#coalesce

Note however that the first frame is usally either a complete frame (there was not data present before that) OR a 'zero delay' frame that just sets a background for the rest of the the animation. It is the second and later frames that will need the 'coalesce' to de-optimize the animation (for pixel count and data compression).

See Cleared Frame Animations -- adding a background.
http://www.imagemagick.org/Usage/anim_basics/#cleared

Of course as most web browsers don't handle a 'zero delay frame' correctly (just doing the action but skipping its display of zero time) such frames are not common.