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PICT Resource
(Mac OS) A PICT resource is a PICT file but takes a name and resource ID number. The PICT Resource format supports RGB images with a
single alpha channel, and Indexed Color, Grayscale, and Bitmap mode images without alpha channels.
You can use the Import command or the Open command to open a PICT resource. However, Photoshop cannot save to this format.
Pixar format
The Pixar format is designed specifically for high-end graphics applications, such as those used for rendering three-dimensional images and
animation. Pixar format supports RGB and grayscale images with a single alpha channel.
PNG format
Developed as a patent-free alternative to GIF, Portable Network Graphics (PNG) format is used for lossless compression and for display of images
on the web. Unlike GIF, PNG supports 24-bit images and produces background transparency without jagged edges; however, some web browsers
do not support PNG images. PNG format supports RGB, Indexed Color, Grayscale, and Bitmap mode images without alpha channels. PNG
preserves transparency in grayscale and RGB images.
Portable Bit Map format
The Portable Bit Map (PBM) file format, also known as Portable Bitmap Library and Portable Binary Map, supports monochrome bitmaps (1 bit per
pixel). The format can be used for lossless data transfer because many applications support this format. You can even edit or create such files
within a simple text editor.
The Portable Bit Map format serves as the common language of a large family of bitmap conversion filters including Portable FloatMap (PFM),
Portable Graymap (PGM), Portable Pixmap (PPM), and Portable Anymap (PNM). While the PBM file format stores monochrome bitmaps, PGM
additionally stores grayscale bitmaps, and PPM can also store color bitmaps. PNM is not a different file format in itself, but a PNM file can hold
PBM, PGM, or PPM files. PFM is a floating-point image format that can be used for 32-bits-per-channel HDR files.
Radiance format
Radiance (HDR) is a 32-bits-per-channel file format used for high dynamic range images. This format was originally developed for the Radiance
system, a professional tool for visualizing lighting in virtual environments. The file format stores the quantity of light per pixel instead of just the
colors to be displayed on-screen. The levels of luminosity accommodated by the Radiance format are far higher than the 256 levels in 8-bits-per-
channel image file formats. Radiance (HDR) files are often used in 3D modeling.
Scitex CT
Scitex Continuous Tone (CT) format is used for high-end image processing on Scitex computers. Contact Creo to obtain utilities for transferring
files saved in Scitex CT format to a Scitex system. Scitex CT format supports CMYK, RGB, and grayscale images and does not support alpha
channels.
CMYK images saved in Scitex CT format often have extremely large file sizes. These files are generated for input using a Scitex scanner. Images
saved in Scitex CT format are printed to film using a Scitex rasterizing unit, which produces separations using a patented Scitex halftoning system.
This system produces very few moiré patterns and is often demanded in professional color work—for example, ads in magazines.
Targa
The Targa (TGA) format is designed for systems using the Truevision video board and is commonly supported by MS-DOS color applications.
Targa format supports 16-bit RGB images (5 bits x 3 color channels, plus one unused bit), 24-bit RGB images (8 bits x 3 color channels), and
32-bit RGB images (8 bits x 3 color channels plus a single 8-bit alpha channel). Targa format also supports indexed-color and grayscale images
without alpha channels. When saving an RGB image in this format, you can choose a pixel depth and select RLE encoding to compress the
image.
TIFF
Tagged-Image File Format (TIFF, TIF) is used to exchange files between applications and computer platforms. TIFF is a flexible bitmap image
format supported by virtually all paint, image-editing, and page-layout applications. Also, virtually all desktop scanners can produce TIFF images.
TIFF documents have a maximum file size of 4 GB. Photoshop CS and later supports large documents saved in TIFF format. However, most other
applications and older versions of Photoshop do not support documents with file sizes greater than 2 GB.
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