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I have two images in logo folder preinstalled in ebook (Pocketbook 612).

Well, I take them and see this information.

> identify 1_st.bmp
> 1_st.612.bmp BMP 600x800 600x800+0+0 8-bit PseudoClass 256c 481KB 0.000u 0:00.010

Next, I try to create same formatted images with convert utility of imagemagick and with gimp.

Convert utility

I use this command to create images:

 convert Ah.jpg -resize \!600x800 -colorspace Gray -depth 8 -type palette Ah.bmp

And identify check:

> identify Ah.bmp 
> Ah.bmp BMP 600x800 600x800+0+0 8-bit PseudoClass 256c 508KB 0.020u 0:00.030

But book says: unsupported format

GIMP

I try to create pictures by gimp, cut them to size 600x800 and use grayscale mode.

And identify check:

identify Oh.bmp Oh.bmp BMP 600x800 600x800+0+0 8-bit DirectClass 1.44MB 0.000u 0:00.010

Again, book says: unsupported format

Also, I rename pictures with suffix .612 (Oh.612.bmp) but this method doesn't work too.

Could anybody help me?

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I met with same problem on my Pocketbook 912, and after some time I figured out how to solve it. BMP should be in indexed color mode and without compression. ImageMagick by default producing RLE compressed bmp. For indexed palette I am using default logo image 1_st.912.bmp.

So if you have image with right resolution you can do this:

$ convert someimage.png \
    -background white \
    -alpha remove \
    -depth 8 \
    -colors 256 \
    -type grayscale \
    -remap 1_st.912.bmp \
    -dither FloydSteinberg \
    -compress none  BMP3:outlogo.912.bmp

Here's another example, how I converted OpenBSD's puffy to pocketbook logo.

$ wget -O Puffy.gif http://www.openbsd.org/art/puffy/puf800X689.gif # download image
$ convert Puffy.gif \
    -background white -gravity center -extent 825x1200  \
    -alpha remove -depth 8 -colors 256 -type grayscale \
    -remap 1_st.912.bmp -dither FloydSteinberg -compress none \
    BMP3:puffy.912.bmp

This command will resize canvas, center original image and convert it to supported by pocketbook bmp file. Note: since you have other resolution, you should change 825x1200 string to your device's resolution.

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