Is your camera supported by Camera Raw?

What Color Space and bit depth are the tiffs?

Do you think that, there will be some quality issues after then ?

You seem to be throwing away data that might be useful later on – both with regard to dimensions and contrast and color related image content.

Regards,

Pfaffenbichler

If professional printing of the images is an option it’s a bad idea to »mutilate« them early on.

srgb is a small Color Space, so using that may be a bad idea unless you work definitively exclusively for the web.

And personally I consider working in 8bit a problematic decision, at least if color and contrast corrections might be necessary.

Have you tried converting the Raw images to dng?

That might also shrink the size somewhat without doing as much damage.

For web purposes using srgb is fine and even advisable. (And I guess some labs may also request it depending on their output devices and preferences.)

For use in high quality prints or publications srgb may simply not make use of the available gamut and a larger space might produce better results.

But when using a larger Color Space working in 8bit is more problematic when also having to create images for smaller Color Spaces.

When converting an image of a larger to a smaller Color Space there are several options for handling the »excess colors«; one can determine which one to use under Render Options > Intent in the Convert to Profile-dialog.

But for example when using »Relative Colorimetric« the resulting color values have to be created from but a segment of the originally available ones, and the smaller the original number the more pronounced the deterioration gets – even if it may be unnoticable with many or most images you edit.