Closed tonynoce closed 1 year ago
Thank you for opening the issue!
I do think what you are seeing is exactly what should happen though. Imagemagick's identify
says about your image above:
identify -verbose 232267475-846fe66f-a015-4910-b330-3d2a87de2255.png
Image:
Filename: 232267475-846fe66f-a015-4910-b330-3d2a87de2255.png
Format: PNG (Portable Network Graphics)
Mime type: image/png
Class: DirectClass
Geometry: 1920x1080+0+0
Units: Undefined
Colorspace: sRGB
Type: TrueColorAlpha
Base type: Undefined
Endianness: Undefined
Depth: 8-bit
Channel depth:
red: 8-bit
green: 8-bit
blue: 8-bit
alpha: 1-bit
So it is a TrueColorAlpha
image with an Alpha Channel which says none of the pixels should be visible. Oculante does the correct thing: It shows the image as fully transparent (as my browser does in your example image, and all other desktop viewers I tried on my linux machine). The difference is that Oculante can show the "hidden" image data.
Is it a good user experience currently in Oculante? I don't think so. Right now you just get a grey screen, so you don't even know if your image loaded. The new release will have a "checkerbox background" pattern soon, maybe that could help? Also maybe drawing a small frame around the image could help? I could also store the mode in the user preferences, so you set Oculante to RGB once and it will remember it.
I am a bit clueless how to improve your experience other than the things above - if I make RGB the default display, many users will wonder why the alpha channel does not display. I could switch the mode if the image is completely transparent, but for that I'd need to go every pixel in the image, which costs a lot of performance.
Happy for your feedback!
This is how it could look with a frame:
And with a checker pattern:
Well the checkboard pattern is the general consensus of an alpha being zero or transparency :D And the grey lines are also a nice touch !
I did realize that I approached this with a compositing program instead of with an image viewer one, below I made some contact sheets with RGBA channels to further illustrate the issue... But I guess that this is more of a general issue with premult and unpremult as you say before, since this is something that most user don't have to deal with it.
All images below are unpremult :
I have also added the feature to remember your last channel settings between restarts. You can then set the mode to "Rgb" and oculante will remember this. I hope this will make it easier for you. Thanks for the example images!
Closing this as I have released a version with fixes as outlined above
The default view for images seems to be RGBA which is fine for most use cases but in VFX an alpha channel can be ignored since the composition doens't have to rely on an Alpha to be there. Yet it is exported as black or in some cases with information.
Currently the fix is to change to RGB by hand, but if the channel Alpha is equal to 0, there is no GUI feedback and the user only sees a grey window.
I saw the unpremult example in the test and made this one, with the corresponding use case escenario: ( the pic is down here )