Hi,
There seem to be a bug in the BMP plugin. I've tried to write a single
channel file, using the following call:
ImageSpec spec(width, height, 1, TypeDesc::UINT8);
if(out->open("Test.bmp", spec)) {
success = out->write_image (TypeDesc::FLOAT, buffer);
out->close();
}
and the resulting file seems to be corrupted. It does contains some
data, but the configuration is not correct:
OIIO cannot reopen the image.
GIMP sees a grayscale black image
Photoshop sees a indexed color image, with an completely black color
table. Building a grayscale color table fixes the problem.
The depth of the image is computed using:
m_dib_header.bpp = m_spec.nchannels << 3;
From this page
(http://msdn.microsoft.com/en-us/library/windows/desktop/dd183386%28v=vs.85%29.aspx)
I understand that 8bpp files (which is the case if I write only one
channel) must be palettized. "Bitmaps that are 1, 4, or 8 bpp must have
a color table with a maximum size based on the bpp".
So my guess is that the plugin should create a grayscale palette if
'nchannel' is equal to 1.
Any thoughts ?
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