It would be cool to have an option to turn on proper filtering when zooming out in the VFB. As it seems to me now the VFB doesn’t do filtering at all at any zoom level. I know this is propably not implemented for speed reasons but an option to enable it, like a little button in the VFB would be beneficial.
Why would you want that? zooming is showing you bigger pixels, if you need to scale up use an image processor like photoshop…
Sorry, I wasn’t clear enough - I was talking about zooming out.
As gregvfx asked, why do you need filtering when zooming either in or out.. I can see no logic in it. For me personally, it is nothing but a preview window and any real editing, is better done using a separate program. Therefore this idea of filtering, is totally unnecessary.
It makes the image smoother and shows me a better view of my final image. What is there more to want? Not wanting it (or at least an option for it but I really only see the option for speed purposes, why else would you actively decide for an unfiltered image??) is like saying “Meh, no need for a combustion engine, horses get me there, too!” 
It really is about improving the preview and for example reducing moir?e effects when having the image zoomed out to view it entirely. Noone would actively decide against improving preview quality at nearly no expense.
It is not “at nearly no expense”. Filtering an image can be a very slow operation. We actually have a version of the code that does this, but it is not enabled by default. It is somewhere on the “to do” list to research more efficient ways to do the filtering.
Best regards,
Vlado
Alright, that’s good to know, thanks Vlado! That version of the code is only internal I guess? No hidden script command or anything like it in the official builds?
As for the computational expense of it: Photoshop does it at an incredible speed via the GPU I guess? Not really a technical background here on my side, all I know is I can zoom extremely, extremely fast in and out with no steps inbetween.
I think you misunderstood me somewhat. While I can understand what it is you are saying. at the end of the day, viewing the image at a smaller size, so that you can see the whole thing, is obviously not what the end result will be. The end result being the image at 100%.. It is just a preview and I for one am more than happy with the way that works. .and the moire effect you mention, isn’t that much of a problem, since I know that I can view it at 100% and be sure that the moire, is nothing but a feature of the preview…
BUT.. when you said “without the steps in between” I have to admit, that a smooth zoom, would be nice to have, rather than fixed 25. 50. 100. 200 percentages the VFB has at present, however if it’s coding / implementation, were to in anyway shape or form, cause any lag, in what is already a very fast zoom in and out (at least for me) then as I say, I see no reason for it…
As for the combustion engine / horses analogy… Just remember the golden rule… Keeping things as light as possible, nearly always means they are more efficient. The more complex something is, the more that can (and will go wrong).. Keep it light, make it as fast as possible and keep out any and all superfluous stuff, that is not absolutely necessary. Just look at the stripped down supercars, stripped of all that luxury, they do the one thing, they were initially built for. SPEED… put all the luxury back in, and yes you will please all those that love all the gadgets and having all those buttons and switches to play with, but for every gram you add, you will lose ?? in raw speed.
Then again, if you can add new features and not affect the speed /efficiency then by all means GO FOR IT.