Adobe Photoshop CC 2014 v.14.xx - Manual (Page 849)

Standard PDF files
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Created when Preserve Photoshop Editing Capabilities is deselected in the Save Adobe PDF dialog box, or by using another
application such as Adobe Acrobat or Illustrator. Standard PDF files can contain multiple pages and images.
When you open a standard PDF file, Photoshop rasterizes vector and text content, while preserving pixel content.
PICT File
PICT format is used in Mac OS graphics and page-layout applications as an intermediary file format for transferring images between applications.
PICT format supports RGB images with a single alpha channel and Indexed Color, Grayscale, and Bitmap mode images without alpha channels.
Though Photoshop can open raster PICT files, it cannot open QuickDraw PICTs or save to PICT format.
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.
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