We determined that our cells were easy to recognize in the saturation channel. No, let’s take a look at our mental note. Instead, our conditions are:Īnd since no pixel satisfies these conditions, nothing is colored in red. If everything can be answered with “yes”, our pixel fulfills our filtering condition and is colored as red. Is the hue between 0 and 255 (unfortunately our 360° are mapped to 255 values.Let's adjust our filter so that everything passes. Select 0 on the upper slider of each filter, and 255 on the lower slider. Now, before we come to the Pass check box, we need to understand what this filter does. This will be indicated as a black rectangle on the histogram. With the scroll bars beneath the histogram, we can select a range. Since we have a lot of reddish cells, we can see a peak in the red area of the hue-histogram. The histogram displays how many pixels have a certain hue, saturation or brightness. These buttons are not relevant for us in this example.įilters: The filters are made of histograms, a range selection (the two scroll bars) and a mysterious Pass check box. The last button ( Macro) can create code used for automation. Stack applies your settings to the remaining images, if you have a stack open. Sample will try to create a filter based on the current selection. Selection creates a selection containing everything that “passes”.The last will create a picture in which the “selected” signal is white and background is black. You can change the color between red (default), black and black and white. Everything that certain criteria - which we will talk about later - is indicated in red. Filtered creates a color coded version of your image.But for now, we will leave HSB selected.īuttons: There are also several buttons. RGB and see how the three controls will change to red, green and blue. Since I’ve selected “HSB” at the bottom (in the Color space setting), these “parts” are hue, saturation and brightness. The vast majority of space is occupied by settings corresponding to the “parts” of our color model. General layout: You can notice that the window is split in several parts.
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