Digital Light & Color

The previously illustrated Step1 masks are relatively easy to create because the PurpleFringe [PF] edges are contrasted against nearly homogenous backgrounds but what can one do where the background has complex tone/colors and PF occurs in non-silhouette image areas? A suggested technique would be t...

MaciejT... and Others A last suggestion and this is one you will have to try on your own image and 'pixel peek' as the posting resolutions really do not show this approach to best advantage... and it is easier to do then previous Step2 suggested alternatives.... Step1: again use the Mask Tool to cre...

If the suggested Alternate Step1(b) "Overlap 'lower left' Apply a BrightnessCurve=[0,100], [100,0]" provides insufficient change, try: "Overlap 'lower left' Apply a BrightnessCurve= BrokenLine [0,100], [50,100], [100,50]". This Overlap BrokenLine curve will apply full strength ch...

In reviewing my notes... I would like to offer an alternate Step1 mask workflow as the originally suggested mask applies changes equally to the lighter saturations/tones and to the darker saturations/tones at the PurpleFringe edges. The following mask will allow changes more strongly to the darker s...

Currently with PWP5 and depending upon image content, I have been experimenting the neutralization of ''purple fringe' by: Step1: create an edge mask limited to the 'fringe' image area(s) by: (a) using the Mask Tool - Paint (All Pixels) tool with a medium radius and soft-side at 0% transparency; 'Ad...

After a bit more experimenting... for a Gaussian Blur one could use BobC's approach, i.e.... a scaled Gaussian Blur on a downsized image version, then upsize the blurred image to its original image dimensions... a bit easier then the previously suggested approach with the Mask Tool - Blur and Extrac...

For a Gaussian Blur greater than 128 and if you have PWP5... you could use the Mask Tool - Blur function which has a max radius of 1000 to create a large blurred image version by: (1) Extract 3 channels of the original image [R,G,B or H,S,V or H,S,L]; (2) select an extracted channel image; open the ...

Thank you Jonathan... and... Perhaps a bit OT and if you have not tried it... ...PWP5's Color Remap transform can provide control/blending when neutralizing an image's mid-tone color casts that may result from multiple light sources or types at distrbuted tone levels [25%, 50%, 75%] after setting th...

Add'l comments: Perhaps to more directly address 'why does a new color appear lighter or darker than its original with the same RGB-->HSL-L to L value?'... Try changing only the HSL-H [Hue] to obtain a new color. Does the new color appear 'lighter or darker'? It shouldn't. With the definitions for s...

Ref: Wikipedia 'HSL and HSV' article: http://en.wikipedia.org/wiki/HSL_and_HSV . [Note: Picture Window Pro gets a brief mention in the 'Use in end-user software" section] Based on this reference, I am not sure that there is an easily determinable transfer function between sRGB Relative Luminanc...