At 09:01 PM 2/8/2008, you wrote:
>I'm using Irfanview (www.irfanview.com) to work with some photos.
>Converting a jpeg of about 1MB, 800x600, to an uncompressed
>tiff gives me over 11MB.  Even a LZW compressed tiff is over 8MB.
>Is this right?  I know tiffs are large but this seems excessive.

I took a photographic jpg, resized it to 800 x 600 pixels and saved as
uncompressed TIFF and LZW compressed TIFF (using Photoshop).

Sizes were 1.39MB and 922kB respectively.

You'd expect the uncompressed size to be the header, plus 800 x 600 x 3
= 1.37 MB plus header (probably includes a thumbnail)

Doing the exact same thing in Irfanview 4.1 (no thumbnail) results in a
1.37 MB file.

Something is wrong.. perhaps your original file size?

>Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com



-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist