Grayscale expected

[markie]

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...).

[micheus]

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?

[markie]

Hi micheus.
Yes, I after I open image in GIMP it shows only one grey channel.

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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?

[micheus]

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.

[markie]

Right, totally forgot I can control the maps. Thank You

[markie]

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.

[dgud]

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.