Red and Blue

by Gordon

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This looks like a stuck/hot pixel in the sensor. Due to the demosaicing algorithm, it has affected not just one pixel in the output image but also four diagonally adjacent pixels. I would be willing to bet there is a single red or green pixel on the sensor right there that is incorrectly reading too bright. The other faint dot to the right may be a blue ...


How to do a mask with a gradient (first question) Use the Layer Mask. Menu Layer -> Mask -> Add Layer Mask. The menus "Edit Layer mask" and "Show layer mask" let you select and draw to the mask instead the layer directly. You are able to use all tools like gradients, brushes and even filters like gaussian blur to have a nice gradient around your freehand ...

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