When I invert the colors in Blender, I don't get the same result at all as Photoshop. The middle-grey background should not change, but it gets brighter in Blender while it stay the same value in Photoshop.
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asked May 30, 2016 at 16:15
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3 Answers
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Blender will generally linearize colors when importing 8bit images. Photoshop does not. Normally, Blender's behavior is correct but in this case you are encoding data here, not colors. You can inform Blender of this and disable the de-gamma step by setting your input color space to "linear" or "raw" instead of "sRGB".
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$\begingroup$ Thank you for you answer. I had already tried the linear and raw mode, the background grey doesn't change when i invert the image, but the source image appears brighter and the result is brighter than Photoshop. $\endgroup$ May 30, 2016 at 17:09
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$\begingroup$ Blender will also convert back to non-linear when saving, this seems to be the other issue. When I set color management to "none" AND the input space to "linear", the result is the same as Photoshop. Not sure if there's another way to disable gamma correction of the final output apart from disabling CM or saving as OpenEXR. I thought "save as render" did this, but it doesn't seem to work here. $\endgroup$ May 30, 2016 at 17:21
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$\begingroup$ It works but it becomes hard to manage the other images and colors. For example an image attached to a multiply node with a completely white color becomes darker. $\endgroup$ May 30, 2016 at 18:04
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1$\begingroup$ Yeah, globally disabling CM is a very poor solution, it should be bypassed specifically for saving the cavity map. Just not sure how to do that. $\endgroup$ May 30, 2016 at 19:12
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2$\begingroup$ That also won't quite nail it. The problem is that an inversion is on display referred encoded values, and as a result, a 2.2 power curve won't invert entirely 1:1 with Photoshop, and it certainly won't work at all on scene referred data coming from Cycles. "Inversion" of a colour has no real-world equivalent, and is rather a hack to achieve something else. For alpha, which is always a bounded 0..1 linear ratio, 1.0- value will work correctly. $\endgroup$– troy_sJun 5, 2016 at 0:28
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Here is the node setup to invert the colors properly:
answered Feb 1, 2017 at 11:29
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$\begingroup$ Using this, I do not get the same depth map back. Why is that? $\endgroup$– AmirMar 10, 2018 at 7:23
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Here's a visualization of how you can change the color space to "Raw" so that you can do inversion properly:
Before inversion:
After inversion:
And for depth maps (connect the Z-pass to a Normalize node first)
Before inversion:
After inversion:
