Quote - Can you enlighten me further on these points.

A PDF does not guarantee exact color printing. It requires you to create it properly and the printer to have some clue about what to do with it for 'color precision' to be a realistic expectation.

PDF has many uses and is not really a 'text format'. It is used extensively in Graphics / Prepress / Printing because it pulls together all elements of the job into a single file: images, fonts and vector graphics are all embedded in the document.

As for saving images for file transfer, here's what I'd recommend:

1. get your image ready to go
2. convert it to LAB color, flattening if required
3. save as LZW-compressed TIFF

Why?

LAB color is device independent and purpose-neutral: it's the most straightforward method of providing color accuracy.

The way it encodes the image means that you will get more efficient LZW compression (which is lossless, don't forget).

But check that the person you're sending it to can handle LAB color images.

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