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DPChallenge Forums >> Photography Discussion >> Quick question about "High Pass"
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07/01/2008 09:39:44 PM · #1
I took a picture for the current open challenge and accidentally discovered that if I use high pass on it, it makes it look like there is fog in my picture. Is that legal? The rules say that I can apply a filter in basic if I apply it to the whole image and as long as the filter is not an "effects" filter. Would the high pass in this situation be considered as an effects filter?
07/01/2008 09:46:16 PM · #2
Not positive about your situation but if you used a duplicate layer or different blending mode other than "normal" I do believe that is illegal.
07/01/2008 09:47:54 PM · #3
I've gotten DQ'd for the use of High Pass Sharpen in basic
07/01/2008 09:48:18 PM · #4
The process of doing high-pass filtering involves making a mask out of the image layer (whether this is done manually, or by an automatic high-pass filter). It's therefore not legal in Basic.

Edit to Add:
A good rule of thumb is that filters that only *globally* affect hue/saturation or luminance are usually OK. Most other filters are not. There are specific allowances for gaussian blur, added noise, and noise reduction filters. A good way to add a "glow" in a Basic-legal workflow is to apply a gaussian blur of a few pixels to the image, then immediately select Edit>Fade Gaussian Blur and set the slider to somewhere between 30% and 45%. Don't change the blend mode on the Edit>Fade dialog, though.

Message edited by author 2008-07-01 21:53:25.
07/01/2008 11:16:58 PM · #5
Thanks for the responses everyone!

Kirbic, I didn't want to add a "glow." I wanted to add fog to draw attention away from the ugly sky that had gone all white because the scene was high contrast and I didn't have enough memory left on my card to shoot RAW : ) I know adding stuff is illegal, but I was hoping I'd somehow ingeniously stumbled upon some sort of loop hole : )
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