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So when adding vegetation to a scene we don't want to see a square image of grass, but rather only show the actual grass and see through the rest of the image. We want to discard the fragments that show the transparent parts of the texture, not storing that fragment into the color buffer. After the fragment shader has run and all the tests have passed, this blend equation is let loose on the fragment's color output and with whatever is currently in the color buffer. The source and destination colors will automatically be set by OpenGL, but the source and destination factor can be set to a value of our choosing. Let's start with a simple example: Another technique that can help enhance your illustrations is masking. Masks allow you to selectively apply effects or transparency to specific parts of your artwork without affecting the rest of the image. This means you can use masks to create subtle transitions between colours or textures, add highlights or shadows that follow the contours of a shape, or even simulate depth-of-field effects like blurring or fading away distant elements in your composition. Note that with fully transparent objects like the grass leaves we have the option to discard the transparent fragments instead of blending them, saving us a few of these headaches (no depth issues). Using multiple layers and blending modes takes practice, but it’s worth the effort when you see the results. Not only does it bring dimension and interest to your artwork, but it also allows you to express your creativity in new ways. So don’t be afraid to experiment and try out different combinations until you find the perfect blend! Experimenting with different blending modes:

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GL_FUNC_ADD: the default, adds both colors to each other: \(\bar{C}_{result} = \color{green}{Src} + \color{red}{Dst}\). Factor is equal to \(1 - alpha\) of the destination color vector \(\bar{\color{red}C}_{destination}\). The glBlendFunc(GLenum sfactor, GLenum dfactor) function expects two parameters that set the option for the source and destination factor. OpenGL defined quite a few options for us to set of which we'll list the most common options below. Note that the constant color vector \(\bar{\color{blue}C}_{constant}\) can be separately set via the glBlendColor function. You’ll get more use out of a blender that’s easy to clean, so look for those where all the removable parts are dishwasher safe. Some blender jugs will split apart so that the blades can be safely cleaned separately and more thoroughly. If the jug has fixed blades, it can be difficult to clean around them by hand, so always use a brush. Our how to clean a blender guide has more tips. Are blenders noisy? Usually we can simply omit a call to glBlendEquation because GL_FUNC_ADD is the preferred blending equation for most operations, but if you're really trying your best to break the mainstream circuit any of the other equations could suit your needs.All blenders will be noisy, though some more than most. The pitch can differ from blender to blender, too, meaning that some noises, while not louder, are more annoying than others. If possible, try before you buy. Will my small kitchen accommodate a blender? For example, if you want to add warmth to an illustration with cool colours, try using the Overlay blending mode. Or if you want to reduce saturation in some areas while increasing it in others, try using the Colour blend mode. Whatever effect you’re going for, remember that blending modes are highly customisable and can take some experimentation before achieving optimal results.

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begin{equation}\bar{C}_{result} = \bar{\color{green}C}_{source} * \color{green}F_{source} + \bar{\color{red}C}_{destination} * \color{red}F_{destination}\end{equation} The controls are devilishly simple to get the hang of – there are five programmes at the push of a button, such as green smoothie, frozen dessert or soup (designed to heat up ingredients rather than blend already hot soup), plus a manual dial for ramping up through 12 speed settings and an LCD screen showing count up or count down times.This function sets the RGB components as we've set them previously, but only lets the resulting alpha component be influenced by the source's alpha value. Using layer masks is an essential skill that any illustrator should master to create flawless compositions. Layer masks give you more control over your design by allowing you to selectively hide or show parts of a layer, making it easier to blend and merge multiple elements. With layer masks, you can achieve a polished look without having to start from scratch.