Re: colorsync-users digest, Vol 2 #102 - 12 msgs
Re: colorsync-users digest, Vol 2 #102 - 12 msgs
- Subject: Re: colorsync-users digest, Vol 2 #102 - 12 msgs
- From: Jack Bingham <email@hidden>
- Date: Thu, 21 Dec 2000 08:31:42 -0800
>
I have a pre-press production guy asking me to expose all my digital
images using a Macbeth chart and adjusting my exposure so that the 3rd gray
patch reads 113. He tells me that this allows his color guys to correct
color without actually looking at the items in the shot. Am I crazy in
thinking this is nonsense? As with film, a good exposure is one that
provides the most detail in the item being shot. If an item is white, a
slightly darker exposure yeilds an image with detail. With a black item, the
opposite is true. So how can I use only one exposure (the one that renders
the 113 gray) for all items?
>
Thanks in advance
>
Andy
This is why printers should not be photographers, First you need to take into
acoount that each image may have a different tonal range. An image that is 80
percent light values will require a different exposure than one that is 80
percent dark values. Exposure is a highly subhjective issue that can not be
distilled down to a specific set of values. Secondly, just because you match the
gray patches there is no guarentee that the colors will convert from rgb to cmyk
in a linear fashion. Colors that are way out of gamut will require some
modification. You are by no means crazy. Perhaps you either need another
pre-press guy or you need to be making your convertions and color corrections
yourself.
Jack Bingham