Changing size of a file. TIFF?

I need to keep a file of less than 100 MB as a .tiff to a given 8 x 10 size. What happens if something can do to decrease the size of the file without changing the dimensions for the tiff?

Thank you.

two factors affect the file size of a tif beside the size in number of pixels. depth of bits and compression. If you use 8 bits in the export, your file size will remain a factor two 16-bit. Compression you can win an even more important factor. zip compression is usually the best and is lossless, so there is no downside to using it.

size of the uncompressed file is easy to calculate. If you have a file 8 bits to 8 x 10 and 300PPI you get 8*10*300*300*3/1024/1024=20.6 MB. (Size horizontal * vertical size * PPI * PPI * number of color channels/bytes per kbyte/Ko Mo) a 16-bit uncompressed file would be 41.2 MB. The use of compression usually gives you a factor of 2, so it seems that your files are always quite small at 300 ppi.

Tags: Photoshop Lightroom

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