In this tutorial you will learn how to find the gray point for photo correction using the tools. Curves (Curves) or Leveland (Levels).
If everything is more or less simple with black and white, in order to find gray with certain parameters (in neutral gray, the values of all color channels are the same and are 128, that is, R: 128, G: 128, B: 128) work hard
How to do it quickly and accurately? Now and find out.
Step 1. Open the image. Create a new layer by clicking SHIFT +CTRL +N, or the corresponding icon in the layers palette.
Step 2. Fill the layer with 50% gray. To do this, go to the menu Editing – Fill (Edit – Fill) and in the drop-down list of the dialog box, select 50% gray color.
Step 3. Change the blending mode of the gray layer to Difference (Difference). In this mode, the color of the pixels is determined by the difference between the original and imported colors. Simply put, if the colors on both layers are the same, they are displayed as black. That is, the neutral gray color on the original image will turn black.
Step 4. Add an adjustment layer Isogelium (Threshold).
Move the slider all the way to the left, then start moving it slightly to the right until a small number of pixels appear. These will be areas corresponding to 50% gray.
Step 5. Now you need to mark this area. We hover the cursor on it, taking the form of a pipette, and click while holding the key SHIFT. A check mark appears.
Step 6. Now you can remove the adjustment layer and the fill layer, they completed their task. Now add the Curves or Levels adjustment layer. Select the pipette point of gray and click on the marked area. For greater accuracy, you need to zoom in on the image.
Step 7. Here is the final result after the correction. As you can see, everything is simple and fast.
See you at the new lessons!