- A measure of how many pixels fit into a given space
- Measured in dpi or ppi
To maintain quality
- Set camera to highest quality
- Be careful when resizing in PS
- Use suitable monitor resolution
- Use a printer with hight DPI
- Books/magazines: 260 to 450 dpi
- Newspapers: 135 to 150 dpi
- General: 300d dpi
A camera raw image file contains minimally processed data from the image sensor of either a digital camera,image scanner, or motion picture film scanner. Raw files are so named because they are not yet processed and therefore are not ready to be printed or edited with a bitmap graphics editor. Normally, the image is processed by a raw converter in a wide-gamut internal colorspace where precise adjustments can be made before conversion to a “positive” file format such as TIFF or JPEG for storage, printing, or further manipulation, which often encodes the image in a device-dependent colorspace.
JPEG compression is used in a number of image file formats. JPEG/Exif is the most common image format used by digital cameras and other photographic image capture devices; along with JPEG/JFIF, it is the most common format for storing and transmitting photographic images on the internet.
TIFF (originally standing for Tagged Image File Format) is a file format for storing images, popular among graphic artists, the publishing industry, and both amateur and professional photographers in general
SD is Photoshop’s native file format, sometimes it’s called PDD. PSD or PDD is a widely accepted file format. PSD supports all available image modes (Bitmap, Grayscale, Duotone, Indexed Color, RGB, CMYK, Lab, and Multichannel).
The PSD format is extremely useful as it can support duotones, clipping paths and channels. Moreover, PSD offers a unique feature – it supports layers while every other format must be flattened on export. Any program that supports PSDs directly can then leverage this layer information. Saving as layered images is quite handy as it allows to edit different parts of an image at a later date far easier.