bob powell [mvp]

There are no 8bpp non-indexed formats that I am aware of.

Is this a mobile format perhaps?

I would imagine that encoding such an image wouldn't be difficult unless
it used some wierd compression scheme also. You could write a
brute-force encoder if you knew the target format.

--
Bob Powell [MVP]
Visual C#, System.Drawing

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js

Is this a grayscale image? If so, just use the indexed format and use
a 1-to-1 palette (i.e. where the palette index equals the palette
value). If it's color, then I don't believe the framework supports 8-
bit color bitmaps except with indexes.

The indexed image already is limited to 256 colors, an 8-bit non-indexed
image isn't supported by .NET to my knowledge... why do you need an 8-bit
non-indexed bitmap?

michael c

I don't.

Michael

Sorry... I wasn't asking you, I should have replied to Norbert directly... I
was asking them why they needed a non-indexed 8 bit image...

michael c

It appears that Norbert has lost interest. :-)

Michael

wes lowe

I'm currently having a similar problem to Norbert.
I have an indexed multi page tiff file, and I need to apply a watermark
to the second page of the tiff. Unfortunately I can't do
Graphics.FromImage(currentFile); because it an indexed image.

I need a way to convert it from an indexed image so I can apply a
watermark. Unless anyone can suggest how I might add a watermark to an
indexed tiff file?

Cheers for any help

Wes

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michael phillips, jr.

To convert any indexed image, use Lockbits to access the image bits
directly.

Create a 24bpp or 32bpp destination bitmap.

For each source indexed image scanline, look up each pixel in the
palette(i.e., each pixel is an index into a palette of colors) and upack it
to your destination 24bpp or 32bpp bitmap. The palette provides you with a
distinct red, green and blue color for each index.

See Bob Powell's excellent examples for using Lockbits.

Find great Windows Forms articles in Windows Forms Tips and Tricks
http://www.bobpowell.net/tipstricks.htm

Answer those GDI+ questions with the GDI+ FAQ
http://www.bobpowell.net/faqmain.htm

wes lowe

Cheers for the speedy reply.

I've read through bob powells lockbits page and i feel like an idiot
because I don't know where to start implementing it.

If anyone can help simplify this that would be great, I'm really
struggling to make head nor tail of it.

Ideally I'd like an example of a 1bppindexed file being converted to 24
or 32bppnon-indexed file.

Once again, any help is appreciated, although I'm beginning to think I'm
getting in too deep here.

Thanks again.

Wes

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