I use canvas 5000x5000 pix, but in jpg and png formats picture has really low quality. What do I need to fix this?
JPGs are always ugly because they use a lossy compression. You can crank up the quality slider to 100% but you will still end up with jpg artefacts.
PNG should be exactly the same after exporting it because that’s what Krita uses internally. However your image is 5000x5000 pixels and your screen probably only has a resolution of 1920x1080 pixels so for any programs that wants to show your image it has to scale it down drastically first. Depending on how it does it, it will look ugly in full view and when you zoom in the quality “gets better” as pixel counts start to match the ones on the screen.
Also, if you source file was a jpg, exporting to png will change nothing because the damage was already done when saving as a jpg.
Does this mean I have to resize a canvas to 1920x1080?
And does this even make sense when art is on sale? I mean, maybe someone has a screen resolution larger than mine.
@Takiro was explaining why you get the effect that you do. An exported .png will be of exactly the same ‘quality’ as your original 5000 x 5000 image made in krita. It’s just that you can’t see the detail on an ‘average’ size monitor, unless you zoom in to look at a subregion of the image.
If you’re printing onto A3 or other large size paper (with a good quality printer), or displaying on a high resolution monitor, then the detail will be visible.
Although 4k displays get more common they are still pretty rare and your image is still bigger.
However, having bigger canvases has it’s use. You can work better on details, filters and certain brushes like the smudge brushes work better with more pixels. For printing bigger is usually better too, although dpi comes into play as an additional factor and the capabilities of the printer are the limiting factors for quality.
I often work on bigger canvases than you do but for the web I usually have to resize the image a lot at the end as it would be to big to upload on most websites anyway.
The exact issues with the quality are hard to pin down too. Without seeing what you do and what the image is, it could also be just you setting some export settings different although the resolution difference of screen and image always comes into play.
That said: yes, maybe someone has a better screen than you but that will not change how you see it on yours.
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