Wallpaper Image Format Questions

[mccainm]

I couldn't seem to get an answer to this online but I may not have been asking it/them correctly. Can someone shed some light on this:

- Windows allows for wallpapers to be selected from a variety of image formats, to include lossless (BMP, PNG) and compressed/lossy (jpg). If you select a lossless format, does Windows compress it and possibly reduce quality before/when displaying as wallpaper?

- Within image formats, or simply compression settings for jpegs, does file size only affect storage or does it affect RAM usage as well? For example, does a jpeg saved with lower compression (presumably better image quality) use more RAM when opened (e.g. as wallpaper) than one with more compression and smaller file size? Likewise, when setting Win 10 wallpaper will there be a RAM usage difference if selecting an image in PNG or BMP, or should I convert it to jpg first?

 

[rgd1101]

1)no
2)yes, it need more ram, it cache the image.
what file size/format are we talking about?

 

[mccainm]

1)no
2)yes, it need more ram, it cache the image.
what file size/format are we talking about?

Thanks...shouldn't affect too much with a machine with suitable RAM vice maybe a cell phone. My question centered on whether there could be a system performance impact of using a wallpaper in PNG (say 2+ MB file) vice converting it to a jpg and reducing the file size to less than 1 MB (or even 100K). Your answer indicates there is a tradeoff between image quality as wallpaper and the memory needed...I wasn't sure if file size affected storage size only or if when used as wallpaper something else was going on. Thanks for confirming.