This assumes that the colors are all as bright as possible, but of course, you have a range of color available, so some red plus some green plus some blue equals gray, and a bit of red plus a bit of blue equals dark purple. And with color on the screen, you are mixing light, not paint, so the mixing rules are different as well. First, the primaries are different: red, green, and blue (i.e., "RGB" color). Digital colors are also constructed by mixing three primary colors, but it works differently from paint. The more paint you added, the darker it got. Swirling all colors together resulted in a muddy brown. Remember finger painting? By mixing three "primary" colors, any color could be generated. In addition, if we draw two shapes, p5.js will always use the most recently specified stroke and fill, reading the code from top to bottom. Also, remember not to eliminate both-with noStroke() and noFill(), nothing will appear! Our instinct might be to say "stroke(0)" for no outline, however, it is important to remember that 0 is not "nothing", but rather denotes the color black. Stroke or fill can be eliminated with the functions: noStroke() and noFill(). Stroke(0) // Setting the outline (stroke) to blackįill(150) // Setting the interior of a shape (fill) to grey Here's an example.īackground(255) // Setting the background to white There is also the function background(), which sets a background color for the window. In between, every other number-50, 87, 162, 209, and so on-is a shade of gray ranging from black to white.īy adding the stroke() and fill() functions before something is drawn, we can set the color of any given shape. Let's start with the simplest case: black & white or grayscale. Color, rather, is defined as a range of numbers. Saying "Hey, can you make that circle bluish-green?" will not do. In the digital world, when we want to talk about a color, precision is required. ![]() If you find any errors or have comments, please let us know. Each transparent GIF can be instantly downloaded by clicking the "Save as" and "Download" buttons.This tutorial is from the book Learning Processing by Daniel Shiffman, published by Morgan Kaufmann, © 2008 Elsevier Inc. To see all the transparent pixels at a glance, you can turn on the black and white filter, which displays transparent areas in black color and all opaque areas in white. In this case, you can use the "Show One Frame" option that will pause the GIF player and display only the requested frame. Sometimes, you need to see how one particular frame looks like. You can also turn on the built-in GIF player and view the transparent GIF frame by frame. To make all frames transparent, enter the "*" symbol. Frames that will be made transparent can be listed as "1, 2, 6" or specified as a range "2-5". By default, the application makes all GIF frames transparent but if necessary, you can remove the color only in the specified frames. By increasing or decreasing the threshold value, you can control the transparent color's tint, tone, and shade. ![]() The color can be entered as a name ("blue"), hex or RGB code ("#0000FF" or "RGB(0, 0, 255)"), or selected via the attached color palette in options. When you specify the color that should change to the transparent color, then it matches this color everywhere in the GIF. As a bonus, our app also allows making any GIF region transparent (not just the background). For example, if your GIF has a red background, then you can enter "red" or hex code "#FF0000" in the transparent color field, and this red background will be assigned the transparent color index, which will make it disappear from the output GIF. This is a browser-based program that creates GIF animations with a transparent background.
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