London Posted December 26, 2020 Posted December 26, 2020 I run into several issues with 32-bit exr files and parts of the image that are >1,1,1/100% white. Normally, when I load my overexposed exr files (my renderer outputs files that are overexposed by about 12 stops for reasons I don't understand) and slap an exposure layer on top of it, everything is fine. However, today, I put in one of my light outputs and the overwhite part turned black with a blue fringe—a problem I'd gotten before by setting a layer with overwhites to screen (which apparently produces divide by 0 errors—I worked through this in earlier posts here and here). I double and triple checked to make sure the layer was set to normal, but it still produced the weird error, so, in frustration, I opened the file in Photoshop, corrected the exposure, and saved the file. It came in perfectly—or so I though until I tried to make some bloom. My bloom techniques uses a macro to create a mask of all the overwrite areas, which I blur and then use an exposure layer to control the intensity. Two problems arose, one of which I often encounter: the blur goes rectilinear and hard as the blur distance goes up, like the underlying algorithm really doesn't like values greater than 1. The second is a black rectangle showing up when the blur values got above 0.8 pixels. Eventually, I realized this was because there was one small area of the image with the overwhite-goes-black problem. I don't know if this is a related problem and I don't have screenshots of it, but I've also run into random rectangular areas that are darker or more saturated when I output some large file to jpg or png. I don't save the bad files, and the problem is fixable by outputting to a different format. But it's annoying because I both have to export more than once and the errors aren't always obvious, so I sometimes have posted them to an art group forum before I spot the issue. I'm using Affinity Photo 1.8.6 on MacOS 10.15.7 on a 2017 MacBookPro with 16 GB Ram and Intel HD Graphics 630 plus AMD Radeon Pro 555 GPUs. Quote
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