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chadchat
Joined: 16 Sep 2012
Posts: 1
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 Posted: Sun Sep 16, 2012 1:08 am Post subject: Matching greyscale images |
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I am working with 16bit (Tiff) greyscale Heightmaps, images that displace geometry to create terrains.
When I want to adjust the images I do it in one of several applications that return the Heightmaps with an altogether different range of levels (value of blacks and whites). However I have no way of matching the levels of the updated image to the original except to eyeball it using Levels. This is time consuming and hard to get right.
I tried changing the images to RGB and color matching them, which is kind of what I want to do, but it leaves me with stepping (similar to an 8bit image) because the range it is trying to match is so subtle I think.
Does anyone know how to better use Levels to perfectly match (greyscale) images, or have another approach that might work? |
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thehermit
Joined: 05 Mar 2003
Posts: 3987
Location: Cheltenham, UK
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| Posted: Tue Sep 25, 2012 6:06 am Post subject: |
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I really am regretting starting this, as I know little of what I am going to say (not a strong point to start from).
My one thought is a 50% grey layer set to difference blend mode. This would allow you to see areas of difference between the 'heights'. Of course this only helps in the 'eyeballing' between the layers.
My natural response as a retoucher would be then to dodge and burn to match the layer values. I would use two curve adjustment layers one mid-curve down and one up. Set a black mask for both adjustment layers and use a white brush at 1-3% flow and 25-100% opacity to bring the levels to the desired amount.
Of course there could be a simpler answer and because of my limited Photoshop remit am missing.
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If life serves you lemons, make lemonade! |
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