Explain the Compression Options when recording in TIFF format

Adobe PhotoShop CS5 offers three options for the conversion of a RAW file to TIFF (ZIP, LZW and JPEG).

I would be grateful if someone can help me understand the following.

I do not understand which of these employ the "run-length encoding" system which should make the TIFF

the file is much smaller than the RAW file.  I used three types of compression, but the only one who

has resulted in a substantial reduction in size was JPEG compression.

The TIFF file without compression is actually twice the size of the raw file.

What are the LZW and ZIP compressions doing?

Thank you

How did you get to the conclusion that the tif should be smaller than the RAW files?

jpg is a lossy compression, so better avoid uo until the final output.

As for lzw and zip (from the help):

LZW (Lemple-Zif-Welch) Lossless compression; support language PostScript, PDF, GIF, and TIFF file formats. Very useful for images with large areas of single color.

ZIP Lossless compression; supported by the PDF and TIFF file formats. Like LZW, ZIP compression is most effective for images that contain large areas of single color.

So image noise for example denying all economies, and I think that zip with 16-bit is a problem.

Tags: Photoshop

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