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System/Library/ColorSync/Profiles/Library/ColorSync/Profiles/Network/Library/ColorSync/Profiles~/Library/ColorSync/ProfilesOn other systems the steps involving colordir will be omitted.Acceptable ICC profiles. The type of acceptable ICC profiles depends on the usage parametersupplied to PDF_load_iccprofile( ):> If usage=outputintent, only output device (printer) profiles will be accepted in PDF/Xmode, and any profile in PDF/A mode.> If usage=iccbased, input, display and output device (scanner, monitor, and printer)profiles plus color space conversion profiles will be accepted. They may be specifiedin the gray, RGB, CMYK, or Lab color spaces.The sRGB color space and sRGB ICC profile. PDFlib supports the industry-standardRGB color space called sRGB (formally IEC 61966-2-1). sRGB is supported by a variety ofsoftware and hardware vendors and is widely used for simplified color management forconsumer RGB devices such as digital still cameras, office equipment such as colorprinters, and monitors. PDFlib supports the sRGB color space and includes the requiredICC profile data internally. Therefore an sRGB profile must not be configured explicitlyby the client, but it is always available without any additional configuration. It can berequested by calling PDF_load_iccprofile( ) with profilename=sRGB.Using embedded profiles in images (ICC-tagged images). Some images may containembedded ICC profiles describing the nature of the image’s color values. For example,an embedded ICC profile can describe the color characteristics of the scanner used toproduce the image data. PDFlib can handle embedded ICC profiles in the PNG, JPEG, andTIFF image file formats. If the honoriccprofile option or parameter is set to true (which isthe default) the ICC profile embedded in an image will be extracted from the image, andembedded in the PDF output such that Acrobat will apply it to the image. This process issometimes referred to as tagging an image with an ICC profile. PDFlib will not alter theimage’s pixel values.The image:iccprofile parameter can be used to obtain an ICC profile handle for theprofile embedded in an image. This may be useful when the same profile shall be appliedto multiple images.In order to check the number of color components in an unknown ICC profile use theicccomponents parameter.Applying external ICC profiles to images (tagging). As an alternative to using ICC profilesembedded in an image, an external profile may be applied to an individual imageby supplying a profile handle along with the iccprofile option to PDF_load_image( ).ICC-based color spaces for page descriptions. The color values for text and vectorgraphics can directly be specified in the ICC-based color space specified by a profile. Thecolor space must first be set by supplying the ICC profile handle as value to one of thesetcolor:iccprofilegray, setcolor:iccprofilergb, setcolor:iccprofilecmyk parameters. SubsequentlyICC-based color values can be supplied to PDF_setcolor( ) along with one of thecolor space keywords iccbasedgray, iccbasedrgb, or iccbasedcmyk:3.3 Working with Color 65