Računarska grafika.

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Presentation transcript:

Računarska grafika

Izvori digitanih slika Crtanje (u nekom od grafičkih softvera) Print screen (slikanje ekrana) Skeniranje (unos slika sa papira u računar) Fotografisanje (slikanje realnosti) Preuzimanje sa interneta (preuzimanje sa drugih računara)

Računarska grafika Podeljena je u dve velike grupe: Rasterska grafika Vektorska grafika

Rasterska grafika Rasterska grafika (bitmap) je slika koja predstavlja pravougaonu mrežu piksela, odnosno obojenih tačkica. Uveličavanjem (zoom) rasterske slike se uviđa nedostatak, tj. uveličavaju se i pikseli. Svaki piksel je posebno definisan, pomoću odnosa boja (najčešće RGB i CMYK).

RGB i CMYK RGB (Red-Green-Blue) Tipično podešavanje boja (vrednost između 0 i 255) CMYK (Cyan, Magenta, Yellow i key (crna)) Vrednost se obično kreće između 0 i 100

Rasterska grafika Primer uveličane rasterske slike. Prikaz proizvoljna tri piksela sa njihovim odnosom boje.

Vektorska grafika Vektorska grafika je način prikazivanja slike pomoću geometrijskih oblika kao što su tačke, linije, krive i poligoni. Za razliku od rasterske grafike, vektorska grafika ne gubi na kvalitetu nakon uveličavanja (zoom)!

Formati grafičkog zapisa Najpoznatiji zapisi su: .jpg ili .jpeg (Joint Photographic Experts Group) .gif (Graphics Interchange Format) .bmp (Bitmap) .tiff (Tag-based Image File Format) .png (Portable Network Graphics)

Konverzija između različitih formata Postoji pregršt besplatnih programa za konverziju između raznih grafičkih formata, kao npr. Free image converter, Pixillion Image Converter, i slični. Međutim, jednostavnije je pokrenuti neki program za obradu grafike (npr. Paint koji se već nalazi u sklopu operativnog sistema), i sa naredbom Open učitati zapis koji želimo konvertovati, i potom sa naredbom Save As... sačuvati u neki drugi - željeni format.

Hvala na pažnji!