Animated gif with slide transition?

[poke53281sys64738]

Hello,

I'm wondering if it's possible, and how, to create an animated gif from a sequence of images where each image slides to the left off the frame as the next image slides in?
Thanks!

[snibgo]

Sure, it's possible. Each output frame is a crop of two input frames that are appended sideways. The WxH of the crop is the same size as the inputs, the crop y-offset is zero, and the crop x-offset varies from one frame to the next.

This is easily done in a script. In v7, you can probably create the entire sequence in a single command.

Instead of crop, you can use "-distort" with a viewport.

[GeeMack]

I'm wondering if it's possible, and how, to create an animated gif from a sequence of images where each image slides to the left off the frame as the next image slides in?

As snibgo mentioned, using ImageMagick 7 it can be done in a single command with just a handful of individual operations.

Consider the total layers in the final GIF would be the number of input images multiplied by the number of steps moving from one image to the next. A smooth transition could be dozens or hundreds of GIF layers. Even with small sized input images you could end up with a pretty large output file size.

The command or script would depend on your version of IM and the operating system you're working on.

[poke53281sys64738]

snibgo and GeeMack, thank you both for your responses, helped a lot and I came up with something like this to do the sort of thing I want:

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convert \( 1MuEL6cu.* -resize 192x +append \) \( -clone 0 -crop 192x+0+0 -set delay 100 \) \( -clone 0 -crop 192x+48+0 -set delay 25 \) \( -clone 0 -crop 192x+96+0 \) \( -clone 0 -crop 192x+144+0 \) \( -clone 0 -crop 192x+192+0 -set delay 100 \) \( -clone 0 -crop 192x+240+0 -set delay 25 \) \( -clone 0 -crop 192x+288+0 \) \( -clone 0 -crop 192x+336+0 \) -delete 0 -loop 10 +repage test.gif

takes a series of images, resizes to 192px wide, and appends them all together. then starts moving along the appended image cropping by the 192px width, pausing for 1s on the first, then moving more quickly along until it gets to the 2nd, another 1s, pause, etc.

i expect there could be more elegant ways to do this, not sure if there's some kind of loop construct that can be used to iterate the individual clone/crop commands? but for now this works and I can write a script to generate the full command based on desired input/output.

thanks again!
ken

[GeeMack]

i expect there could be more elegant ways to do this, not sure if there's some kind of loop construct that can be used to iterate the individual clone/crop commands? but for now this works and I can write a script to generate the full command based on desired input/output.

Using ImageMagick 7 on Windows 10 I can do this at a command prompt and make the entire animated GIF in one command...

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magick ^
   *.jpg ^
   -set option:frames %[fx:(n*4)-1] ^
   -gravity center ^
   -resize 200x200^^ ^
   -extent 200x200 ^
   ( -clone 0 ) ^
   +append ^
   -duplicate %[frames] ^
   -define distort:viewport=200x200 ^
   -distort affine "%[fx:t*(200/4)],0 0,0" ^
   -set delay %[fx:t%4?10:500] ^
   -loop 0 ^
   -layers optimize ^
      output.gif

That starts by resizing and cropping all the JPGs to make 200x200 squares and appends them into a strip. Then it duplicates the strip enough times to pull one animation frame from each. Then it makes each frame by doing a sort of shifting crop with "-distort affine...". After that it sets the delay speed to 5 seconds for every 4th frame, the ones that are whole images, and a tenth of a second for the ones doing the slide transition. Do "-loop 0" to make it repeat the animation cycle. Do "-layers optimize" to reduce the file size by reusing pixels that are the same from one frame to the next.

This almost surely will not work with ImageMagick 6.

You'd have to translate that to *nix shell syntax by using "\" instead of "^" as continued line characters, probably escaping parentheses with "\", not escaping the "^" on the "-resize" operation, and changing any double quote marks to single quotes. I haven't tried it on a *nix shell, so it might need a couple other tweaks, too.

[fmw42]

Downside is it uses a lot of memory for all the repeats of the strip. But it is a nice implementation in IM 7.

[fmw42]

One thought might be to use -roll and a fixed crop with a clone or mpr that could be re-written and deleted as needed.

[anthony]

Distort can be used to create a animated crop in IMv6 as it was shown above.
But you should be able to do the same thing directly using crop in IMv7 "magick"
But I do not have time (or setup) to work it out at this time.

Remember the big feature of IMv7 is that 'percent escapes' should be able to be used in almost all operations, not just specific ones (like -distort and -set) as in IMv6

[anthony]

An alternative idea. is to make use of the GIF 'previous' disposal.

That is start with one image with a disposal of 'none', then all later frames are just the part of the image that 'overlays' that static background, as partial frames. Should be a lot smaller and faster than generating the full image each time.



Now a 'wipe' animation is actually even easier (and very small GIF file wise), as that is just overlaying frames consisting of just 'slivers' of the overlay image (which is what a 'tile crop' generates!)

convert rose: \( -clone 0 -flip -crop 5x0 \) -set delay 20 miff:- | animate -

and with the flip back again...

convert rose: \( -clone 0 -flip -crop 5x0 \) \( -clone 0 -crop 5x0 \) -set delay 20 miff:- | animate -

Just added it to IM examples.. Wonder why I never thought of it years ago!
http://www.imagemagick.org/Usage/anim_mods/#wipe

[GeeMack]

Wonder why I never thought of it years ago!

That looks pretty useful. Here is an example with IM7 in Windows syntax. It shows how to set the delays so each full image pauses a fraction of a second before the next wipe begins. It also shows how to make the wipe come from the left, top, right, or bottom of the image.

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magick ^
   -size 240x160 ^
   gradient:green-yellow gradient:blue-purple gradient:orange-white gradient:red-black ^
   -write mpr:stack -delete 0--1 ^
   -delay 200 mpr:stack[0] ^
   ( -delay 10 mpr:stack[1] -crop 10x0 ) -delay 200 mpr:stack[1] ^
   ( -delay 10 mpr:stack[2] -crop 0x10 ) -delay 200 mpr:stack[2] ^
   ( -delay 10 mpr:stack[3] -crop 10x0 -reverse ) -delay 200 mpr:stack[3] ^
   ( -delay 10 mpr:stack[0] -crop 0x10 -reverse ) ^
      -loop 0 wipe.gif

It starts with the first image paused with "-delay 200" and ends with the first image again making the wipe to start the loop over.

[anthony]

Hmm I didn't know you could pull just one image out of a list saved to MPR. That is useful to know!

Added this to the examples..

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  convert -size 100x60 -delay 100 \
      gradient:green-yellow gradient:blue-purple \
      gradient:orange-white gradient:red-black \
      -write mpr:stack -delete 0--1 \
      \
      mpr:stack'[0]' \( mpr:stack'[1]' -set delay 5 -crop 4x0 \) \
      mpr:stack'[1]' \( mpr:stack'[2]' -set delay 5 -crop 0x4 \) \
      mpr:stack'[2]' \( mpr:stack'[3]' -set delay 5 -crop 4x0 -reverse \) \
      mpr:stack'[3]' \( mpr:stack'[0]' -set delay 5 -crop 0x4 -reverse \) \
      -loop 0 wipe_all.gif

Also added this to the "MPR:" examples...
http://www.imagemagick.org/Usage/files/#mpr

When you do have multiple images in "mpr:" you can actually still extract individual images from that sequence! Using "mpr:image'[2]'" will pull the third image from a multi-image sequence saved using "-write mpr:image".
For example here I extract the 'storm' image from a set of four images.

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  convert eye.gif news.gif storm.gif tree.gif \
          -write mpr:images  -delete 0--1 \
          \
          mpr:images'[2]'   mpr_extract.gif