TIF getting saved as compressed?

[Tom]

I am loading a TIF file into a bitmap stream (Dim bmp as new bitmap etc
etc). I use GDI+ to draw some text onto the lower left corner of the TIF,
then save the image (i.e. bmp.Save(filename)). However, I am finding that
the original TIF is NOT compressed, but when I save the bmp stream as TIF,
it compresses it. I know this because I load each one into a viewer and the
properties show that the newly saved TIF is compressed via LZW. Problem is,
I don't want it compressed. This is a high quality image and it really needs
to remain as the original is (uncompressed).

Is there something I have to specify during the .Save to tell it NOT to
compress the image? Thanks.

Tom

 

[Bob Powell [MVP]]

LZW compression is lossless unlike JPEG compression. What's the problem with
using an image format that gives you a smaller file for the same quality?

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

Find great Windows Forms articles in Windows Forms Tips and Tricks
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[Bob Powell [MVP]]

You can still use the image encoders but you have to know which encoders are
good for which file format. For example the CCITT4 encoder is only good for
1 bit per pixel TIFF's

There are no simple rules to follow. It all depends what you want to do.

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

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

All new articles provide code in C# and VB.NET.
Subscribe to the RSS feeds provided and never miss a new article.