Yeah its possible
and Yeah, its so easy you'll laugh your donkey off.
Simply save your background as a normal .bmp, rename it 01-12.bmp, and put it in /vsh/resource. Then go to Theme settings and select the top theme and voila you have a nice full res background with waves on top of it.
There are 2 known side effects:
1) You can only have one theme now.
2) The panels like the themes settings or when you click triangle in the Photo's menu, which are usually the color of the theme, are now grey.
But I can live with that...
ya i know about this method. but anyway thanks for sharing :)
im trying to fix the 1st side effect but i don't think itll work..
Ok there is a way to fix both problems, i havent completely figured it out yet but its almost working.
The first problem is because of a limitation in the themes thing, I think its limited to a total of 480x272 = 130560 pixels. So if you resize the main background in a way so other backgrounds still fit, it should work, but there is more limits which are something like every image has to be a multiple of x pixels to work proberly. Maybe if someone could make a 0x0px bmp file, ive tried 1x1 doesn't work.
The second problem is because if you use only one image, it appears to the PSP as the first theme, and the first theme has a grey color. The colors of the themes are fixed somewhere in the PSP firmware, just try flashing an empty 01-12.bmp and then going to the themes settings, you will see the colors are still there. A way to get around this is by putting your background is the right position, e.g. if the main color is red put it in the 12th position because the color for theme 12 is red, thus the menu's will be red. But in order to do that, problem 1 needs to be solved.
By the way hw do wee do this 12 colors in single file :)
you mean how do you make the 01-12.bmp file, out of 12 seperate .bmps? i thought it would involve some complicated hex stuff too, but actually its so stupid simple: 01-12.bmp = 01.bmp + 02.bmp + 03.bmp...... etc
yeah just put them all in a row et voila. heres a batch file:
copy /b 01.bmp+02.bmp+03.bmp+04.bmp+05.bmp+06.bmp+07.bmp+08.bmp+09.bmp+10.bmp+11.bmp+12.bmp 01-12.bmp
Hmm, I've heard of people with successful flashed 480x272 backgrounds, but I've never succeeded myself. Even, I've had trouble with 300x170 - mainly, the alpha on the icons don't work properly (thus they look weird).
I've also try fiddling around with the BMP headers to get multiple large backgrounds, but it appears there's a memory limitation or something, because I always get a white (stuffed) background.
How the PSP works - basically when it's looking for an image, it goes to (month - 1) *6176 and looks at that position.
I might fiddle around with the BMP headers a bit and see if the PSP actually confirms to BMP standards, then perhaps you can try my method for multiple large wallpapers...
Yeah but that's only when you use the monthly thing, you can chose your own theme from the 01-12.bmp in the Theme settings menu. Also some icons turned into white boxes and/or flashed white boxes when you use any image larger than 352x199. I think this may be because of the RAM allocation? because I tried several larger resolutions, first the Browser icon goes bad, then more and more and more every time you use a bigger image.