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File Types, Sizes & Dots Per Inch (dpi)

File Types, Sizes & Dots Per Inch (dpi) Best practices applied to Photoshop file formats when creating media-specific documents. Adobe Photoshop. File Formats. Data Compression is a process of encoding info with fewer bits : Lossless = reversible with more algorithmic data

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File Types, Sizes & Dots Per Inch (dpi)

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  1. File Types, Sizes & Dots Per Inch (dpi) Best practices applied to Photoshop file formats when creating media-specific documents. Adobe Photoshop File Formats • Data Compression is a process of encoding info with fewer bits: • Lossless = reversible with • more algorithmic data • Lossy= loss of data • Bit Depthis the number of colors your image contains: • 24 bit = millions of colors • 16 bit = thousands of colors • 8 bit = 256 colors • 4 bit = 16 colors

  2. Adobe Photoshop File Formats .psd PhotoShop Document dpi 300 pixels • work large! • work in layers

  3. Adobe Photoshop File Formats .jpg Joint Photographic Expert Group dpi depends on purpose • detail 300 dpi • print >150 dpi • screen 72 dpi • JPG is a "lossy" compression, resulting in data loss.Used for photographs and images with continuous tones and large gradients. Do not save/edit in jpg! Image: From the department of unsourced photographic Internet literalisms

  4. Adobe Photoshop File Formats .gif Graphical Interface Format dpi 72 pixels Animated Static • GIF supports images that are 8-bit (256 colors) or less. Use GIFs for illustrations, clip art, and images without gradients. Image: Watt Curve by Claudio Rocchini

  5. Adobe Photoshop File Formats .png Portable Network Graphics dpi 72 pixels • PNG is an improvement on GIF - with gradients and transparencies in "lossless"format - Designed for RGB color palettes, not print.

  6. Adobe Photoshop File Formats .tiff Tagged Information File Format dpi depends on purpose • Archive >300 dpi • TIFF is an adaptable file format for handling images and data within a single "lossless" file or no compression at all. This format is useful for image archiving - can include header tags and vector-based information.

  7. Adobe Photoshop File Formats .pdf Portable Document Format dpi depends on purpose • highly customizable • PDF is an open standard for document exchange with encapsulated information. PDFs can store a fixed-layout document that includes the text, fonts, images, vector graphics and true graphic transparency.

  8. Adobe Photoshop File Formats - Summary .psdPhotoShop Document .jpg Joint Photographic Expert Group .gif Graphical Interface Format .png Portable Network Graphics .tiff Tagged Information File Format .pdf Portable Document Format • Consider… • Bit Depth • Data Compression • DPI (dots per inch) • Vector graphics

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