I know how to trim an image in Photoshop. (choose Image > Trim in Photoshop's menu)

Is there any method to trim a slice to get rid of extra transparent space?


1 Answer 1


Not an answer, but I don't have the rep for a comment yet.

What I do is hide all other layers that aren't part of the slice. Then I add (or enable) a background layer with a different color from the edges of the slice (usually white, black or red). Then I zoom in as far as I can and use the color picker to find where the fade stops and the solid background color begins, and put a guide there. This gets tricky if you have an oddly-shaped graphic that you're trying to slice, where you have to find the most extreme pixel along any given edge. Then it's either 'slices from guides' or re-adjusting the edges of the slice to line up with the guides manually. Then turn off that background layer before I save that slice with transparency.

I suppose another method would be to slice your images roughly, not caring about the exact pixels, then saving the images with transparency. Re-open the images and trim transparent pixels and re-save.

I'd definitely be interested in finding a better way, as this is laborious, time-consuming and error-prone.

  • Thanks for the background layer trick, are there any plugins or scripts can solve this problem?
    – clyfish
    Commented Sep 4, 2013 at 3:05
  • Now I use imagemagick's trim operator to speed up the slicing. First, export the slice to png, then convert slice.png -trim info:, then adjust the X/Y/W/H of the slice and export again.
    – clyfish
    Commented Sep 10, 2013 at 8:19
  • I create a photoshop script which uses imagemagick to trim the slice automatically. Github: github.com/clyfish/slicetrim
    – clyfish
    Commented Sep 24, 2013 at 5:23
  • Nice looking script, I'll have to give it a try, cause I tend to do a LOT of slicing. Commented Sep 24, 2013 at 13:20

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