Hänvisar till genomskinlighet. En alfakanal tillåter genomskinlig kontroll. Ett visst bildformat må endast innehålla en enda alfakanal som tillåter genomskinlighet på eller av. Andra format tillåter variabel nivåer av genomskinlighet.
Kantutjämning kallas processen då kanter jämnas ut. Kantutjämning skapar jämnare kanter genom att justera dess yttre gräns mellan bakgrunden och pixel regionen som blir utjämnad. I allmänhet ändras en pixels styrka eller opacitet så det blir en jämnare förening mot bakgrunden. Vid markering så ändras markeringskanten, markeringskantens opacitet minskas.
" Taget ifrån Free On-line Dictionary of Computing (13 Mars 01) : bitmap en data fil eller struktur som stämmer överens bit för bit med en bild som visas på skärmen, antagligen i samma format som det skulle vara lagrat i bildskärmens videominne eller kanske som en enhetsfri bitmap. En bitmap betecknas med hjälp utav bredd och höjd av en bild i pixlar och antal nummer av bitar per pixel som avgör antal nummer grå nyans eller färg som det kan representera. En bitmap som representerar en färg bild (en "pixmap") har oftast pixlar mellan ett och åtta bitar för varje röd, grön och blå komponent, fast även andra färgkoder används också. Den gröna komponenten har ibland fler bitar än de andra två, detta för att kompensera ögats extra känslighet för gröna nyanser. "
Varje bild är uppdelad i olika sorters kanaler och sätts sedan ihop innan de skickas till enheten för utdata. En enehet för utdata är oftast en skärm. De kanaler som används när en bild renderas till skärmen är Röd, Grön och Blå. Andra enheter för utdata använder ibland andra sorters kanaler.
Kanaler kan vara användbara vid arbete av bilder där en färg behöver justeras. Om, till exmpel, borttagning av"röda-ögon" är målet, arbete mot den Röda kanalen är oftast det förutsatta valet.
Clipboard is the term used to describe a temporary area of memory that is used to transfer data between applications or documents. The GIMP uses slightly different clipboard approaches when used under differnt operating systems. Under Linux/XFree, the XFree clipboard is used for text and The GIMP internal image clipboard is used for images that are being transferred between image documents. When The GIMP is used with other operating systems, differences may be apparent. Any differences should be outlined in the operating system specific documentation for the individual GIMP package.
The most fundamental operations provided by a clipboard interface allow for Cut, Copy, and Paste. Cut is used to denote the removal of an item that is sent to the clipboard. Copy leaves the item in the document and copies it to the clipboard. Paste copies to the document whatever happens to be in the clipboard. The GIMP will make an intelligent decision about what to paste depending upon the target. If the target is a canvas, then paste operation will use the image clipboard. If the target is a text entry box, then the paste operation will use the text clipboard.
Dithering refers to the math and voodoo involved in renderingan image that has few colors seem like it has many. Dithering is accomplished in different ways depending on the output device and the program. One particularly effective method is clustering pixels of color together in an attempt to simulate another color. This is achieved by the human eye and the tendency for it tomix colors while viewing complex color patterns. A common dithering effect is seen on television screens or in newspaper print.From a distance the images seem to be constructed of many varied colors or shades, but upon closer inspection this is certainly not the case. A color television uses only three colors clustered together in various states of on or off. A black and white newspaper uses only black ink, yet pictures in newspapersappear to be constructed of grey tones. Furthermore, there are techniques used to achieve greater success in dithering.
The GIMP can use the Floyd-Steinberg dithering technique, for example. This dithering method is simply put, a mathematical way of clustering the pixels to accomplish better results thanother dithering methods. Of course, there are always exceptions and there are many different dithering models that are in usetoday.
A way that an image is written. You should select a file format which is suitable for your situation. JPEG and PostScript are examples of file formats.
Feathering is a process by which the edges of a region are softly blended with the background.
Floating selections are similar in function to layers except that floating selections must be anchored before work can resume on any other layers in the image. While a selection is floating, any number of functions can be used to alter the image data contained within the float.
There are two methods available for anchoring a float. The first, and most useful, is to change the float into a new layer. This is achieved by creating a new layer while the float is active. The second method involves anchoring the float to an already existing layer. This is done by clicking anywhere on the image except on the float. Doing so will merge the float with the background layer.
Any pasted selection will be first rendered as a floating selection.
This method of dithering looks at the current pixel color and retrieving the closest values from the palette. These colorsare then distributed to the pixel areas below and to the right of the original pixel.
GNU's Not Unix, an organization devoted to the creation and support of Open Source software. GIMP is an official GNU application.
Guides are a convenient way to help you align layers and tool functions on your drawable image, layer, or selection. Guides are created manually by clicking and dragging from either the topor left rulers in to the image area. They appear as blue dashed lines. They do not print. There are some useful options available to the user to help use guides efficiently, such as Snapto Guides, Toggle Guides, and Center Guide.
A way of representing color in the form #rrggbb where "rr" represents red, "gg" green, and "bb" blue. Commonly used in web design.
Hue Saturation Value, a way of representing color. The Hue is the color like red or blue, the Saturation is how strong the color is and the Value is the brightness. This is sometimes called HSB or Hue Saturation Brightness.
Image Hoses are special brushes that contain many different frames. An exmaple of this might be a footstep brush that contains two images. One of a left footprint and one of a right footprint. During the application of this hypothetical hose brush, one would see the left footprint followed by that of the right in a continuous fashion. This method of animation for brushes is very powerful.
This paint mode renders each brush stroke directly onto the active layer. If incremental mode is not set, there is a canvas buffer that is composited with the active layer.
The two images above were created using a brush with spacing set to sixty. The image on the left shows non-incremental painting and the image on the right shows the difference that incremental painting can produce. Incremental paint mode results in each brush application, through the duration of a stroke, being rendered in addition to any previous brush renderings.