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I've a TIFF-file. Loading the raster image into QGIS does not display correctly. (Using the Add raster layer button.) It seems to be distorted with noise. See image below:

qgis (l), image viewer (r)

The source of the TIFF file is a 300 dpi scanned document. Other scanned documents display correctly.

Projection doesn't matter as the image is not georeferenced yet.

I'm using qgis-1.7.0 in a sabayon-linux environment.

What's the source of this problem? Did anyone else encounter this before? Thanks for any hints or experience on this topic.

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Can you check what raster style is used under Layer Properties -> Style –  Nathan W Dec 26 '12 at 12:59
    
Three Band Colour. That's it! –  vertoe Dec 26 '12 at 13:00
    
hmmm can you post a screen shot of that for me –  Nathan W Dec 26 '12 at 13:02
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It's a greyscale image but the import tried to display 3 bands. Your hint was correct. Switching style to single band fixed it and the raster layer displays correct. –  vertoe Dec 26 '12 at 13:09
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Do you want to post that a answer to you own question. After 2 days you can accept it. You will get rep, and it will also close this question. –  Nathan W Dec 26 '12 at 13:14
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1 Answer

up vote 1 down vote accepted

Qgis does not know this is a grey-scale image and tries to display 3 bands.

Opening the layer properties and the style tab allows you to switch back to grey-scale (single band grey) from coloured style (three band colour).

Thanks Nathan W for pointing out to check layer style properties.

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