'[cairo] Image blending question'

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List:       cairo
Subject:    [cairo] Image blending question
From:       Homer Mu <oldplumber () live ! com>
Date:       2013-08-28 5:26:27
Message-ID: SNT148-W45683ABA6B377B8418149BB54B0 () phx ! gbl
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I apologize if this is a super newbie question=2C but I am having trouble w=
ith basic blending. So far I have had success (and a lot of fun!) with basi=
c compositing of images=2C text=2C and paths / filled paths. However=2C whe=
never I have overlapping objects with varying opacity=2C I struggle with th=
e way the images blend. What I want to achieve is sort of a cross-disolve t=
ype blending (such as what you would see in a slide show screensaver). But =
my results are full of widly varying brightness levels. The blending is pro=
bably working as designed=2C but I just can't figure out how to blend in a =
way that maintains the original image brightness. I have tried many of the =
composting operators (CAIRO_OPERATOR_DEST_OVER=2C etc) without much success=
. Any advice or examples for this type of super basic blending would be gre=
atly appreciated!! Thank you in advance for any help! HM
 		 	   		  =

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<body class='hmmessage'><div dir='ltr'>I apologize if this is a super newbie \
question, but I am having trouble with basic blending. So far I have had success (and \
a lot of fun!) with basic compositing of images, text, and paths / filled paths. \
However, whenever I have overlapping objects with varying opacity, I struggle with \
the way the images blend. What I want to achieve is sort of a cross-disolve type \
blending (such as what you would see in a slide show screensaver). But my results are \
full of widly varying brightness levels. The blending is probably working as \
designed, but I just can't figure out how to blend in a way that maintains the \
original image brightness. I have tried many of the composting operators \
(CAIRO_OPERATOR_DEST_OVER, etc) without much success. Any advice or examples for this \
type of super basic blending would be greatly appreciated!! Thank you in advance for \
any help! HM<br> 		 	   		  </div></body> </html>

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