I have just been watching your video on the many goodies in the new version. I see that PSD images should now show transparency in the viewer.
In my viewer i find it impossible to tell if an image has transparency or not. The best I can do is to set the viewer background colour to white. Of course, that means that when I view a transparent PSD it appears as a "cut-out" picture on white, but I really do not know whether it is transparent. It could simply be an image with an all-white background.
I can easily get round this problem with thumbnails, by creating a Photoshop type checkerboard png image to use as a background. By making the colour transparent it does the job a treat. I can find no way of repeating the trick with the image viewer. I can't make the background transparent and I can't attach a background image.
Just a suggestion for the future. Congratulations on the new Opus. It truly is a program capable of being all things to all men. No mean feat, that
You can set the viewer background to a more conspicuous color, and if you see that color it's probably due to transparency.
There is also the Hide Alpha Channel option in the viewer which lets you toggle the alpha channel on and off and usually confirms whether there is one or not. (Of course, it won't if the image happens to be composited against the same background color the viewer is configured to, but if you choose an unusual color then that is unlikely.)
Similarly, if you display an image in Photoshop, you can't immediately be sure if it has transparency or actually has a checkerboard background. Which isn't entirely theoretical. Some of Nintendo's advertising confuses my eyes every time I see it.
I take your points and that is certainly a way of checking transparency in the viewer. However I would take issue about Photoshop and transparency. In the imaging world a checkerboard background like Photoshop's is the de facto way of indicating transparency. Sure there is a very remote chance (Nintendo notwithstanding) that an image has a checkerboard background, but I can never recall seeing one in over 25 years in the imaging business.
I still maintain the ability to add your own wallpaper to the viewer, would be a nice addition to the new Opus.