error when reading a bmp picture

Hello,

I try to read the attached picture with imread and to put the RGB values into the variable M

M = imread('test1.bmp');

but I get the following error:

Reference to non-existent field 'AlphaMask'.

Error in readbmpdata>bmpReadData32 (line 285)
    rgbaMaskArray = [info.RedMask, info.GreenMask, info.BlueMask,
    info.AlphaMask];

Error in readbmpdata (line 32)
                X = bmpReadData32(info);

Error in readbmp (line 17)
X = readbmpdata(info);

Error in imread (line 415)
    [X, map] = feval(fmt_s.read, filename, extraArgs{:});

Has anyone an idea where the error comes from? Thanks!

Cheers Guillaume

[Titus Edelhofer]

Hi Guillaume,

is it really a .bmp file? Sometimes such errors occur when the file is stored e.g. as .jpg and then renamed ...

Titus