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- #Photoshop spot color separation indexed pdf
- #Photoshop spot color separation indexed portable
- #Photoshop spot color separation indexed zip
Hence many features that require Photoshop resource blocks are not supported in HELIOS raster PDF documents: The disadvantages of HELIOS raster PDF documents result from the fact that non-HELIOS applications view HELIOS raster PDF documents as generic PDF documents which do not contain Photoshop resource block data.
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All major image compressions such as CCITT G4, ZIP, JPEG, and JPEG 2000 are supported.All major color spaces such as Bilevel, Grayscale, Indexed, RGB, CMYK, and CIE Lab are supported.
#Photoshop spot color separation indexed portable
HELIOS raster PDF documents are as portable as generic PDF documents applications that can read generic PDF documens can read HELIOS raster PDF documents, too.The advantages of the HELIOS raster PDF format are: This fact has both advantages and disadvantages. All non-HELIOS applications view HELIOS raster PDF documents as generic PDF documents. Therefore ImageServer UB+ supports a new raster image format derived from PDF called "HELIOS raster PDF". Since the Photoshop PDF format is undocumented, it cannot be supported by ImageServer. PDF viewing applications are available for a wide range of platforms, the PDF format includes support for many color spaces, for many image compressions, for ICC profiles and for spot colors. The PDF format can be a very efficient container for raster images. In Photoshop rasterization spot colors are converted to process colors or are lost entirely. Another problem with Photoshop rasterization of generic PDF documents is that it does not feature in-RIP separation. The raster of the raster image within the PDF document and the raster of the rasterization may not fit together well. If this PDF document is re-opened in Photoshop, the raster image is interpreted as vector data which is rasterized. A PDF document created by Photoshop without preserved editing capabilities contains one raster image. The Photoshop import of generic PDF documents often results in substantial loss of quality. Photoshop can open generic PDF documents only by rasterizing them. If this option is turned off, the saved PDF documents do not contain additional private Photoshop data, hence they are not Photoshop PDF documents, but generic PDF documents. When images are saved as Photoshop PDF documents, the "Preserve Photoshop Editing Capabilities" option is important. While some properties of Photoshop PDF documents can be observed without official documentation, many details of the Photoshop PDF format stored within the page-piece dictionaries remain unknown outside of Adobe. This redundant storage of image information requires a lot of disk space and makes the Photoshop PDF format ill-suited for prepress production.
#Photoshop spot color separation indexed zip
The second copy is stored in the additional private Photoshop data and is compressed with the lossless ZIP compression. The first copy is stored according to the PDF standard and uses the compression filter specified during saving, and this compression filter may be lossy such as JPEG. Photoshop PDF documents store two copies of the image they contain. With well-known PDF analysis tools such as the Enfocus Browser it can be observed that Photoshop PDF documents are standard PDF documents with additional private Photoshop data contained in so-called page-piece dictionaries. Most applications that can read PDF documents can also read Photoshop PDF documents. You can safely assume that Photoshop PDF documents are valid PDF documents. In contrast to the documented and open Photoshop EPSF format, the Photoshop PDF file format is currently undocumented and proprietary. Adobe did not specify the differences between generic PDF and Photoshop PDF in the years before 2008, and there is no indication that Adobe intends to document these differences in the future. Photoshop CS3 Help pages state implicitly that generic PDF documents and Photoshop PDF documents are different. Adobe Photoshop offers the Photoshop PDF file format.