Exporting PNG & JPG are both far too pixellated

[SamMN]

So I'm creating an image that has to be set at 800 x 600 pixels, and when I export the image either in JPG (set to best quality) or PNG (PNG sampling is set to bicubic), the result is pixellated and blurred, I don't get what I'm doing wrong. Screenshotting the image of the file opened in Affinity Photo actually creates a much clearer image.

(Running the Mac version, if that helps?)

Help / advice would be much appreciated!

 

(After uploading these it seems that Preview might be partly to blame? It seems that when you click view 'Actual Size' it's not the actual size of the image on the screen. I'm getting very confused :-/)

Edited July 20, 2018 by SamMN

[Polygonius]

Maybe you should search for interaction dpi / computer resolution and stuff like this. Not easy to explain.

[R C-R]

3 hours ago, SamMN said:

(After uploading these it seems that Preview might be partly to blame? It seems that when you click view 'Actual Size' it's not the actual size of the image on the screen. I'm getting very confused :-/)

Preview's preferences allow you to choose between 2 ways to define 'actual' (100%) size for images:

There is an (almost) identical size preference choice for PDF files.

[SamMN]

Ah, thanks for the heads up. Yes, it looks like the issue is sneaky upscaling done for retina displays (which I'm using). For anyone who stumbles across this thread with a similar issue, I found the two comments by st3f and Andrius here to be extremely helpful.

@R-CR Preview is set to that setting and is still upscaling the images. Might be a bug in Preview?

[Polygonius]

On 7/20/2018 at 4:44 PM, SamMN said:

@R-CR Preview is set to that setting and is still upscaling the images. Might be a bug in Preview?

If you use the finder for short view (click file and space) it shows you the correct size by default. In preview you have to reopen the picture afters after changing this option.