Most graphics programs have several means of accomplishing this, such as: One of the prerequisites for many of the applications mentioned below is a method of selecting part(s) of an image, thus applying a change selectively without affecting the entire picture. There are a myriad of choices associated with the application of most of these features. Listed below are some of the most used capabilities of the better graphics manipulation programs. JPEG uses knowledge of the way the human brain and eyes perceive color to make this loss of detail less noticeable. By contrast, the more popular JPEG file format uses a lossy compression algorithm (based on discrete cosine transform coding) by which the greater the compression, the more information is lost, ultimately reducing image quality or detail that can not be restored. Some compression algorithms, such as those used in PNG file format, are lossless, which means no information is lost when the file is saved. Both cameras and computer programs allow the user to set the level of compression. When images are stored in JPEG format, compression has already taken place.
Digital compression of images may take place in the camera, or can be done in the computer with the image editor. Many image file formats use data compression to reduce file size and save storage space. Additionally, some automatic editing features offer a combination of editing actions with little or no user interaction. These are called automatic because generally they happen without user interaction or are offered with one click of a button or mouse button or by selecting an option from a menu. Automatic image enhancementĬamera or computer image editing programs often offer basic automatic image enhancement features that correct color hue and brightness imbalances as well as other image editing features, such as red eye removal, sharpness adjustments, zoom features and automatic cropping. They are also scalable, being rasterizable at any resolution. Vector images can be modified more easily because they contain descriptions of the shapes for easy rearrangement.
#Add an alpha channel to a jpeg in xara designer pro x how to#
It is easier to rasterize a vector image than to vectorize a raster image how to go about vectorizing a raster image is the focus of much research in the field of computer vision. However, vector graphics software, such as Adobe Illustrator, CorelDRAW, Xara Designer Pro or Inkscape, are used to create and modify vector images, which are stored as descriptions of lines, Bézier curves, and text instead of pixels. This article mostly refers to bitmap graphics editors, which are often used to alter photographs and other raster graphics. The pixels can be changed as a group, or individually, by the sophisticated algorithms within the image editors. Image editors can change the pixels to enhance the image in many ways. These pixels contain the image's color and brightness information. Raster images are stored in a computer in the form of a grid of picture elements, or pixels.
0 kommentar(er)
