![]() ![]() Typical examples of opaque data types include handles for resources. The concrete representation of the type is hidden from its users. Now you place this star behind one of the glass windows in your house, without any screens drawn. A few people have proposed file formats that embed PNG transparency info into a JPEG's extended information fields, but these proposal's don't have wide support as of yet. In computer science, an opaque data type is a data type that is incompletely defined in an interface, so that its values can only be manipulated by calling subroutines that have access to the missing information. Transparent Translucent And Opaque Objects How do opaque objects work Imagine you have a star-shaped object like the one shown in the image below. Transparent, translucent and opaque are the materials that can be classified based on the amount of light they transmit. We have talked about how light reflects (bounces) of some objects and is refracted (bent) by other objects. ![]() As light travels, you know it hits many objects. I've saved a few hundred K per image using this technique. HOW LIGHT INTERACTS WITH OTHER OBJECTS SOL 5.3C Transparent, Translucent, and Opaque IT ALL DEPENDS. The JPEG stores the color info (better compressed than PNG) and the PNG is reduced to 8-bit alpha so its considerably smaller. The browser's Canvas does the work of making the image transparent. Now your web page uses a CANVAS tag to load the JPG as image data and applies the 8-bit greyscale PNG as the Canvas's alpha channel. Basically, you create your image with transparency and then split out the alpha channel (Gimp can do this easily) as a simple 8-bit greyscale PNG. It's a bit too complicated to post details, but Google it. While a JPEG can't be made transparent in and of itself, if your goal is to reduce the size of very large image areas for the web that need to contain transparent image areas, then there is a solution. I think even the cell phone apps (Pixlr is pretty good and free!) and web-based image editting apps are better. There are many high quality art applications for doing art work. Plus PNG supports highly quality images.ĭon't use "Paint". Using PNG, you can smoothly "composite" images together, which is what you really want. Since translucent and transparent objects both allow light to pass through, and both start with the. If you use GIF then you will see jagged edges where the background and the rest of the image meet. If it allows all light to pass through, it is transparent. The opposite property of translucency is opacity. 1 Transparent materials appear clear, with the overall appearance of one color, or any combination leading up to a brilliant spectrum of every color. ![]() Just wanted to add that GIF "transparency" is more like missing pixels. A transparent material is made up of components with a uniform index of refraction. ![]()
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