Grayscale album art - 4 bit vs. 2 bit

[mlind]

Call me stupid, but I'm trying out album art on my iRiver H120!
I've made a black/white bmp for a specific band that works fine.
No that I'm trying to make a grayscale version it can not be more than 4 levels for the H120 which is 2-bit.
But I have to save it as 4-bit.

But now it doesn't seem to work with this file.

The file naming is ok - as I said, it has been working previously.

Anybody else had any luck, or have any suggestions for me?

[pixelma]

I was curious as you and tried album art on my M5 which also has a greyscale display.

The few cover.bmps I prepared are all usual colour bitmaps with a bit depth of 24-bits. I did not do the extra step of reducing bit depth on the computer before and it works correctly. Rockbox is able to scale it down but of course you have more control over how it looks if you prepare it on your computer before. A 4-bit bmp should also work and has the advantage that the resulting file size should be a bit smaller.

Are you sure that nothing else got changed when you saved the bmp anew and it is still a "normal" bmp - no compression for example?

[mlind]

Dammit!
I was on a different computer and didn't notice that I saved the BMP in "OS 2" format instead of windows...

Works now.