[LargeFormat] reducing chromatic aberration in Photoshop

[Michael Sullivan]

Dear Jim,

You can reduce chromatic aberration in Photoshop by using the following 
procedure:

- change Image mode to LAB
- go to the A channel and blur it (3-5 pixels)
- go to the B channel and blur it (3-5 pixels)
- go to the L channel and sharpen using unsharp mask as appropriate
- change image mode back to RGB

while not perfect, it "does the trick"

Michael


On May 8, 2004, at 11:34 AM, Georges Giralt wrote:

> Hi Jim !
> I wonder if, given the price difference, I will bother with this small 
> aberration...
> Keep in mind that Arsat does not have access to the better and finest 
> glasses availlable to Westerners, so their design is of an exceptional 
> quality to be comapred side by side with a Zeiss lens...And kept 
> cheap.
> Give them the ability to design using the Japanese or German or US 
> better glasses, and you will have wonderfull lenses...
>

Michael Sullivan
THE PRINTWRIGHT STUDIO
P.O. Box 552
Marshfield Hills MA 02051
617.529.0603 cell
http://www.haywood-sullivan.com/printwright