Trouble with image colors

[apires]

Hi!!
I need that the background screen be the same grey of the image. First, I did change my images to the same colour of the screen (grey 9539985). But I don't know why I cannot make it similar, and I need my images to create apparent movement so they must have the same color than the background screen. I prove changing it to 12 colors and didn't work. Also i downloaded the color.txt but direct rt told me that this computer is not able to use the 24 colors. And also i've changed my screen preferences and nothing changed..
Please, can you give some advice??

Here i attach the style file and 2 images as example

[jarvis24]

I could but could you revise your attachment so that it includes your input file and copy of the colour.txt file? That way I'll try to replicate exactly what you are getting and try to suggest a few options. e.g., as suggested above--did you try using a .bmp image as a background in addition to (or instead of) using a grey background in the drt file?