REQ: Fast method for converting RGB to 1bpp

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Berend - 22 May 2007 13:41 GMT

Hi,
I need to edit 20.000+ TIFFs. Currently I'm converting my TIFF images
back to CCITT4 (after watermarking them) using Bob Powell's method which
can be found at http://www.bobpowell.net/onebit.htm.

However, converting a single TIFF takes about 10 seconds or so.
Is there a faster way? Eg can I somehow load the TIFF into a Graphics
object, without converting it to a 32bit Bitmap?

TIA, cheers!

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Bob Powell [MVP] - 22 May 2007 16:49 GMT

You could open the image as a 1 bpp and merge that and your watermark using
lockbits.

I think this might be faster.

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> Hi,
> I need to edit 20.000+ TIFFs. Currently I'm converting my TIFF images back
[quoted text clipped - 6 lines]
>
> TIA, cheers!

Reply to this Message

Berend - 23 May 2007 12:23 GMT

> You could open the image as a 1 bpp and merge that and your watermark
> using lockbits.
>
> I think this might be faster.

Thanks, will give it a try.
Never programmed using Lockbits before, so I'm up for some trial and
error...

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REQ: Fast method for converting RGB to 1bpp

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