skimage make light spots lighter and dark spots darker

Enhancing Contrast with Skimage: Making Light Spots Lighter and Dark Spots Darker

Skimage, a powerful tool for image processing, offers various techniques to enhance contrast by making light spots lighter and dark spots darker. In this article, we will explore one such technique that involves adjusting the curves of an image using Skimage.

To begin with, select your image and go to the Layers panel in Skimage. Right-click on the Background layer and choose 'New Adjustment Layer' > 'Curves.' This will add a new adjustment layer above the Background layer.

In the Properties panel, you'll see a curve graph with a series of points that control the brightness and contrast of your image. To make light spots lighter, focus on the shadow areas of the image (the darker regions) and ignore the light parts for now. Click and drag the point at the bottom-right corner of the graph upwards to add a new point to the curve.

Next, move this new point upwards in the graph to lighten up the dark areas of your image. You can also use the on-image adjustment tool (the icon with the pointing finger) to automatically add a new point on the curve by clicking and dragging it upwards in a shadow area of your image.

Once you've made these adjustments, select the Curves adjustment layer and choose 'Blending Options' from the Layers panel menu. You'll see that the entire image starts to lighten up as all pixels are affected. To refine this effect, set the Blend Mode under General Blending to Luminosity. This will help restore some color to areas of your image where it was pulled out by the curves adjustment.

By using these techniques, you can effectively make light spots lighter and dark spots darker in your images using Skimage's curve adjustments. Remember that there are various approaches you can take, and we encourage you to experiment with different methods to find what works best for your specific needs.

Skimage make light spots lighter and dark spots darker