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[00:00:05] <travis-ci> [travis-ci] hugovk/Pillow#418 (XpmImagePlugin - c22c8ee : wiredfool): The build passed.

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[00:08:55] <travis-ci> [travis-ci] hugovk/Pillow#419 (XpmImagePlugin - 8db043b : hugovk): The build passed.

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[08:01:24] <travis-ci> [travis-ci] hugovk/Pillow#420 (DcxImagePlugin - 1e24dcd : hugovk): The build passed.

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[14:57:16] <deepy> If I do ImageChops.difference(img1, img2) and save that, how would I apply that difference to img1 to get img2?

[15:03:35] <deepy> Actually, what I what I want to do is save the part that has changed between img1 and img2 so that I can turn img1 into img2 somewhere else

[15:45:41] <deepy> img2 is img2 with some stuff changed

[16:01:20] <wiredfool> deepy: you can't exactly. difference loses information

[16:01:30] <wiredfool> since it's the abs() of the difference

[16:02:15] <wiredfool> you'd need to do something like subtract, and then add, but you'd have to be careful of the scale and offsets.

[16:04:02] <deepy> So there's no easy shortcut to send what I need to make img1 into img2?

[16:04:48] <wiredfool> not if you use difference, since the sign of the difference has been lost

[16:05:07] <deepy> Oh I don't necessarily need difference, it was just the entry point I found

[16:05:26] <wiredfool> however, if you do something like ImageChops.subtract(im1,im2, 0.5, 128)

[16:05:47] <wiredfool> the result there is a 1/2 magnitude difference, offset to the middle of the range.

[16:06:10] <wiredfool> then ImageChops.add(result, im1,0.5, 128) should reconstrut it.

[16:06:51] <wiredfool> you may lose a touch of quality, since you're compressing a difference range of [-255,255] into [0,255], then reexpanding it

[16:07:29] <wiredfool> acactually, the add is wrong.

[16:07:30] <deepy> That gave me a completely white image

[16:07:55] <wiredfool> try -128 for the offset

[16:08:08] <wiredfool> but there's a factor on im1 that's going to need to be applied as well

[16:09:22] <wiredfool> bah, scale's wrong too. and I don't see a way to just multiply by a constant

[16:10:26] <deepy> Couldn't I just save all the areas that have changed and then put that on top and save?

[16:11:04] <wiredfool> you could use difference as a mask, and then apply it using composite

[16:17:29] <deepy> I'm having some slight issues when it comes to understanding the documentation, I'm not entirely sure how to turn the difference to a mask

[16:50:02] <travis-ci> [travis-ci] python-pillow/Pillow#1375 (master - c0e840f : wiredfool): The build passed.

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[20:51:50] <travis-ci> [travis-ci] hugovk/Pillow#421 (XpmImagePlugin - 14d1ac6 : hugovk): The build passed.

[20:51:50] <travis-ci> [travis-ci] Change view : https://github.com/hugovk/Pillow/compare/8db043b35f7d...14d1ac6389fc

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