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+---- Thread: Grayscale expected (/showthread.php?tid=3118)
Grayscale expected - markie - 06-09-2023
After importing grayscale images (Metallic/Roughness/Ambient Occlusion) and applying them to material Wings says "Expected a gray scale image, converting" despite those images already being grayscale.
I found out that after importing image into wings it automatically converts it to RGB (by importing grayscale image and then right click in the Outliner -> Export...).
RE: Grayscale expected - micheus - 06-09-2023
Hi markie
I may have to check the code, but I think the message is displayed when you have an image with three - RGB (or four - RGBA) channels.
Does your grayscale uses only one channel?
RE: Grayscale expected - markie - 06-09-2023
Hi micheus.
Yes, I after I open image in GIMP it shows only one grey channel.
Maybe it's something to do with sRGB/gamma?
Another issue is that after applying Roughness map model becomes very glossy/wet/varnished. Same issue exist in Unreal, and solution was to disable sRGB/use Linear light.
As a workaround I was increasing gamma manually in GIMP.
Is there an option to do so within Wings?
RE: Grayscale expected - micheus - 06-09-2023
About the map, You can control it's influence by using the slides for roughness, metallic which we can set them to 1.0 when a map exists. That means we are going to apply "pure" values in the map.
For the base colour, if the map exists, set the colour to white.
RE: Grayscale expected - markie - 06-09-2023
Right, totally forgot I can control the maps. Thank You
RE: Grayscale expected - markie - 06-14-2023
Update: Wings also exports grayscale images as RGB.
If you create gray image from channel (within wings) and then export it you will get an image with three channels.
RE: Grayscale expected - dgud - 06-16-2023
I don't think any of our image format implementations can export only one channel.
So you will have live with those wasted bytes and warning :-)
Or send me a PR for the image formats.