Re: Profile causes posterisation
Re: Profile causes posterisation
- Subject: Re: Profile causes posterisation
- From: Rick Gordon <email@hidden>
- Date: Tue, 31 May 2005 16:56:53 -0700
And what about alternatively using the ColorSync radio button setting instead (as opposed to either the Color Controls or the No Color Adjustment buttons)? Since this seems a bit of a black box, I don't know for sure to what extent it may duplicate on of the Color Controls defaults or whether it offers up yet something different.
Rick Gordon
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On 5/31/05 at 4:09 PM -0600, Chris Murphy wrote in a message entitled
"Re: Profile causes posterisation":
>On May 31, 2005, at 2:34 PM, Marco Ugolini wrote:
>
>>When using the "Photo-realistic" setting (Print dialog box -> Color
>>management -> Color Controls -> Mode: Photo-realistic) to create a profile,
>>do you also check the "EPSON Natural Color" checkbox, or not? And which
>>Gamma do you select, 1.8 or 2.2?
>
>This is a very interesting question. My understanding of the EPSON Natural Color checkbox employs a gamut expansion algorithm of sorts. Thus, even colors out of gamut for sRGB, could be assumed by the algorithm and printed even though they aren't in the image. I've done little image testing with this setting, but if it's not dynamic (different behavior on a per image basis), and it's well behaved, this could be a good compromise between the far better behaved Photo Realistic mode, and the better gamut No Color Adjustment mode.
>
>For gamma, I've seen no evidence that it matters so long as you remember the setting you used to build the profile. Theoretically gamma 2.2 would improve on shadow detail, since more bits are dedicated to shadows with image gamma 2.2 compared to image gamma 1.8.
>
>>I also assume that you leave all controls (brightness, contrast, saturation,
>>etc.) at zero, correct?
>
>Yes, but mostly because it's easier to remember the settings, and because I really don't feel like experimenting with every single one of these controls and then building a profile to see if it provides any useful behavior (which I doubt anyway).
--
___________________________________________________
RICK GORDON
EMERALD VALLEY GRAPHICS AND CONSULTING
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WWW: http://www.shelterpub.com
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