Re: iCal Calendar Colors
Re: iCal Calendar Colors
- Subject: Re: iCal Calendar Colors
- From: Martin Orpen <email@hidden>
- Date: Tue, 24 May 2005 21:15:41 +0100
on 24/5/05 20:18, Adam Wuellner at email@hidden wrote:
> Question: from where did the need for an additional
> 281,474,976,645,120 discreet colors arise?
>From just about every graphics application that wants to show you realistic
looking colours after you've carried out a few edits! (Photoshop CS2 now
allows you to create and manipulate images at 2^32.)
The problem with 8 bit (as Todd is discovering) is the damage that rounding
errors cause. Simple operations on 8 bit values mean that you normally end
up with ugly looking steps in every area where colours are blended together.
To simply print an image we need to convert it from one device colour space
to another via a reference colour space that is capable of describing
*every* visible colour. You'd be stretching 256 steps pretty far to describe
every red that a human can perceive and the results would look nasty if you
restricted every calculation to only 256 discrete values.
Adobe use 2^15 + 1 rather than 2^16 so that they get the benefit of an
integer at the centre point and can use integer shifts rather than
conventional division and multiplication to speed the millions of pixel
calculations required in image editing.
--
Martin Orpen
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Applescript-users mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden