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Re: [APML] Gradient and Vignette removal software

Title: Message
Geometric gradients can be generated using software and can work well but often a gradient is not a simple geometric shape. For this reason would it not be better to extract the background component from the original image since it would contain both the complex shape and color of the original gradient?
 
Mike
  
----- Original Message -----
From: Jeff Ball
Sent: Thursday, June 27, 2002 8:00 AM
Subject: RE: [APML] Gradient and Vignette removal software

Chris,
I really like Picture Window for correcting gradients, especially if they are simple radial gradients.  In Picture Window you can resize several shapes of gradients; linear, radial, horizontal, vertical, radial sweep, or even setup a multi point.  To me the best feature is that I can see the effects on the image in real time and adjust the amout to be applied while checking the pixel readout in the preview pane. You can also change the color of the gradient correction.  Picture Window gradient correction is very flexible with real time preview.  Good luck.  Please let us know if you try a flat field with film.  I think this would be very interesting to give a try.

Jeff Ball
www.astro-photography.com
Ohio Valley Astronomical Society
www.ovas.org

 
-----Original Message-----
From: owner-astro-photo@seds.org [mailto:owner-astro-photo@seds.org] On Behalf Of Chris Schur
Sent: Thursday, June 27, 2002 12:56 AM
To: APML
Subject: [APML] Gradient and Vignette removal software

Im looking for a simple to use piece of software that removes gradients and vignetting from my schmidt camera images with film.  Ive tried Maxim DL, and I get horrible results, and wondered if there is something I can say put a grid on and it does what it has to do to flatten the brightness of the grid.  Maybe Im overlooking some thing obvious, but doing this in photoshop is a gamble at best.
 
 
Chris Schur