In my case it was tabbed next to the layer docker, and that tends to be it’s default spot in many image manipulation programs, if you can’t find it, try to look under under window->dockable dialogues. We find out where our channels docker is. Secondly, we open up the picture in our image manipulation program of choice(in my case, the GIMP). If you do take a picture, try doing so during the day when there’s plenty of light, and try to make sure the picture is evenly lit. It’s preferable you scan it in(the former image), photographed pictures tend to have a colour distortion(the latter). However, if you scroll down, there’s some explanation of how to do this in Krita. In the case of Krita, which I’ll be using in future tutorials whenever I can, the channel-manipulation tools aren’t very extensive yet. Any image manipulation editor that supports channel-manipulation(they usually have a separate docker for this) will do however. Now, you can use Photoshop for this, but I’ll be using GIMP. In an image manipulation program(colloqially known as a drawing program) specifically, you are looking at the data that tunes into a specific colour channel. Because radio and colours are both forms of light, you can tune into a specific frequency of colour as well. If you’ve ever used a radio, you might know that you can tune into a specific frequency: A channel. To make an efficient approximation of the billions of colours humans can see, monitors and screens made by humans use red, green and blue to display images and store images.Īnd we’re going to take advantage of that today. Specifically, in the case of the purple hues, we actually make it up. Yellow(+- 620nm) would get an avarage reaction from the Middle cones, a large reaction from the long cones, but none from the Short cones.īlue(+-450nm) would get a lot of reaction from the short cones, but hardly any from the Middle and Long cones. Green(+-550nm) would no reaction from the short cones either, but a lot from both Middle and Long cones(most from middle) On the above image, Red(700nm) would get a modest reaction from the Long cone, but no reaction from the Middle and Short cones. By measuring the different signal-intensities between the info these two cones give, our brain is capable of knowing where a colour ranges on the hue range. These cones are differently sensitive to different colours, the long cone for example is sensitive to red, yellow and green, while the middle cone is sensitive to yellow, green and blue. Humans can pick up the full range of frequencies trough method of our three types of colour cones. Like your radio is capable of picking up radio waves and your computer capable of picking up wifi, your eyes are capable of picking up the visible-light frequencies. And with different frequencies the properties of light change: When looked at in a similar manner to sound, light too can have a frequency. Depending on the way you look at it, it’s either made up from tiny particles(like sand, or more specifically, atoms), or waves(like water-waves, or sound). The fancy physicist name for light is ‘electromagnetic radiation’, and there really isn’t quite anything like it in the universe. I’ll be giving you the most elaborate over convoluted tutorial on removing the blue lines from a drawing you could ever hope to wish for.īut first, I’m going to talk to you about light. They will give you step-by-step instructions, giving you the answer to all you problems in ten minutes. Now there are a few tutorials out there which’ll recommend you to use the contrast tools, or the level tools or even the colour-adjustment tools. Only problem is, our notebook is lined-out with blue lines. We’ve all had it that we were happily doodling away in our notebooks, and suddenly we manage to create a very beautiful drawing.
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