Photoshop: Color and Image
Basic concepts and terminology
The Photoshop is a tool for photograph retouching, enhancing and will give you flexible features to produce stunning images which can be put in Web pages.
If you have not fully understood the coloring of your images, you have go through the chapter on Basic Concepts.
Basic Concepts
What is computer graphics? There are two main types of computer graphics- vector and raster images.
Vector images, such as those created in Adobe Illustrator, are made up of mathematically defined lines and curves called vectors.
Raster images, such as those created in Adobe Photoshop, consist of a grid, or raster, of small squares, known as pixels.
Several types of resolutions are important when working with digitized images. They are:
Image resolution refers to the spacing of pixels in the images and is measured in pixels per inch (ppi). If an image has a resolution of 72 ppi, this will have 5184 pixels in a square inch.
Pixel depth (bit resolution) is a measurement of the number of bits of stored information per pixel. Bit resolution determines how much color information is available for each pixel. Greater pixel depth means more available colors and more accurate color representation in the digital image. E.g. A pixel with a bit depth of 8 has 2**8, or 256 possible values (colors); and a pixel with a bit depth of 24 has 2**24 or 16 million, possible values (colors).
Monitor resolution defines the number of dots or pixels per unit length of output. It is measured in dots per inch (dpi). The device resolution for a Macintosh monitor is typically 72 dpi.
Screen frequency, also known as screen ruling, refers to the number of halftone cells per inch in the halftone screen used to print grayscale image or color separation. Screen frequency is measured in lines per inch.
Output resolution refers to the number of dots per inch (dpi) that output device, such as a laser printer reduces.
Image fundamentals: • Bitmapped image as a mosaic made out of square
The Photoshop is a tool for photograph retouching, enhancing and will give you flexible features to produce stunning images which can be put in Web pages.
If you have not fully understood the coloring of your images, you have go through the chapter on Basic Concepts.
Basic Concepts
What is computer graphics? There are two main types of computer graphics- vector and raster images.
Vector images, such as those created in Adobe Illustrator, are made up of mathematically defined lines and curves called vectors.
Raster images, such as those created in Adobe Photoshop, consist of a grid, or raster, of small squares, known as pixels.
Several types of resolutions are important when working with digitized images. They are:
Image resolution refers to the spacing of pixels in the images and is measured in pixels per inch (ppi). If an image has a resolution of 72 ppi, this will have 5184 pixels in a square inch.
Pixel depth (bit resolution) is a measurement of the number of bits of stored information per pixel. Bit resolution determines how much color information is available for each pixel. Greater pixel depth means more available colors and more accurate color representation in the digital image. E.g. A pixel with a bit depth of 8 has 2**8, or 256 possible values (colors); and a pixel with a bit depth of 24 has 2**24 or 16 million, possible values (colors).
Monitor resolution defines the number of dots or pixels per unit length of output. It is measured in dots per inch (dpi). The device resolution for a Macintosh monitor is typically 72 dpi.
Screen frequency, also known as screen ruling, refers to the number of halftone cells per inch in the halftone screen used to print grayscale image or color separation. Screen frequency is measured in lines per inch.
Output resolution refers to the number of dots per inch (dpi) that output device, such as a laser printer reduces.
Image fundamentals: • Bitmapped image as a mosaic made out of square