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Selecting a filter using the Inspector immediately applies this filter, Apply uses the currently selected filter or the user defined matrix again, Undo removes the last applied filter (multiple undos possible), and Off turns all filters off. To copy applied filters from one image to other images use the Display > Copy Filters and Display > Paste Filters (also available from contextual menus) or use their keyboard shortcuts. PhotoStickies remembers applied filters and applies them in real-time again when reverting to a saved state or when a webcam or slideshow sticky is updated. Available filters: Blur light/medium/strong Sharpen light/medium/strong Darker/Lighter Increase/Decrease contrast Correct colors/channels Rotate Channels Black & White. The threshold can be set using the Threshold slider (before and after applying filter). Gray Tint Invert Edge Detect Add Edges (combines image with edge detection) Emboss Add Emboss (combines image with emboss) Interlace Median Scale Bitmap to Current Size. White/Black/Color Transparent. These three filters re-calculate alpha channels to get partial transparency of images and may be applied multiple times or in combination with other filters. The comparison of colors is not exact and the threshold can be set using the Threshold slider (before and after applying such a filter). As all filters are applied to the internal bitmap (which is initially equal to the original size of the image), scaling the bitmap to the currently displayed size is a good way to improve the display quality. E.g. if you want to scale a small webcam to fullscreen you'll see lots of pixels without this. But if you apply this filter and blur the image afterwards, things will look way better. Another example is if you scale down an image and are going to apply a sharpen filter afterwards. No big difference without this, but sharpening after scaling the bitmap improves and really sharpens the result.
Note: With your screen set to "thousands of colors" or with zoomed images the color picker may return incorrect values and therefore sometimes nothing happens.