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Originally Posted by solitear Thanks stosh........ hey, I've got a question for you smartie pants  ........ unless I've missed something (which is happening quite often these days) how is the Difference method easier than holding the shift key when dragging the whole layer onto a matching layer?
Don't be trying to mess me up by using one of those weird blending modes that nobody ever really uses........ you know the ones ........ Difference..... Hard Mix ........ those modes were just put there to make it look like Photoshop was hard....... that's why they're down at the bottom and not at the top of the list.....
oxox
Beth |
Well Beth, my pants may have just gotten a bit less smart.
So far as I know, holding the shift key while using the Move tool restricts the movement to either horizontal or vertical ... nothing between. If your mis-alignment is other than a straight horizontal or vertical line, it won't help to align the images. If there is another use, I'd like to know more about it ... always willing to learn.
The only use I have found for Difference mode (a fancy blend mode at the bottom of the list (:Þ) is exactly what i suggested above ... to align two identical layers or portions of layers of identical images. For example, if faced with merging the overlap of difficult of mis-matched panorama images, you can align them manually by temporarily changing one to Difference blending mode and using the move tool as above. This blend actually subtracts the pixel values of the blended image from the base image. What happens is that when the pixels exactly overlay each other, the net RGB result is 0,0,0 and the pixel goes black. To perform an accurate, exact match, you can move the selected image one pixel at a time using the arrow keys, until you get exact coincidence - a totally black overlap area. It really works a treat ... try it.
BTW, this is not an original idea ... I read it in a book; one of many I often turn to for help. I'll be pleased to share, if you would like the reference.
Stosh
P.S. Here's another amazing shortcut for those esoteric blend modes. Take any image and make a duplicate layer. Select the top layer and activate the Move tool. Now hold the Shift key and click the "+" key ... the blend mode changes to the next one down on the list. By continuing to click the "+" key while holding Shift, the blend modes cycle and you can see what effect each blend mode has on the base image. Select the one you like most and vary the Opacity to lessen the effect to taste. The "-" key moves you up the list to retrace your steps. Now THAT is a smart set of trousers - eh? Same book!