![]() In some regions of the hair you can see that there weren’t any pixels that met the range constraints of 110 to 256, so it left the image alone. It worked for some of the image, but not all of it. Since we determined that the dimmest area of bare paper is 110, by specifying this range we are getting the full range of the paper tone, but as little as possible of the lines in the drawing, and hopefully, getting just the color of the paper out of the filter over most of the image. What we’re doing here is asking Gimp to look at every 30×30 region, and find the median of all the pixels that are brighter than 110 and dimmer than 256. Set Black level to the value of the darkest bare paper (in this case 110), and White level to 256. Turn off “Adaptive.” Turn off “Recursive.” Set the radius as high as it will go. Then open run Filters > Enhance > Despeckle using the following settings. We’re going to use this value to try to remove all of the lines from the image.ĭuplicate the image on a new layer. In this image, the darkest bare paper has a value of about 110. Remember the average value of the three color channels. Then, we’ll use layer modes to remove the effect of the paper tone from the image.įirst, find the darkest region of bare paper on the image, and use the eyedropper to get its color. Our strategy is to produce an image that contains only the tone of the paper using a few filters for shortcuts, and little elbow grease. Nevertheless, with only a few steps, we’ll get a workable image out of it. It was taken with a tiny point-and-shoot camera. The paper isn’t evenly lit, and the lights shining on it have different temperatures. The image I’ve picked to work with has a lot of issues. Worry more about eliminating glare than producing an even tone, because the tone is easy to correct for. The glare of the lines will be directed away from the camera, but you will still get a relatively even tone across the image. Your best bet is to position several lights around the image at shallow angles. Neither is pointing a light directly at the drawing. Graphite has a natural shine, so flash isn’t an option. Lighting is tricky when photographing a drawing. This will show you how to get a great image out of it anyways. Unfortunately, all you have to capture it is a crappy camera and the lights in your living room. You have a sketch that you’re proud of and want to show off, or maybe even sell. ![]()
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