rfc2880.txt
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5.1.1 Bi-level coding<------- T.30 bits --------->15|16|31|36|37|68|69|73|78|79||Feature set expression--+--+--+--+--+--+--+--+--+--++--------------------------------------- x| 0| 0| | | | | | 0| 0||(& (color=binary) | | | | | | | | | || (image-coding=[MH]) ) x| 1| 0| | | | | | 0| 0||(& (color=binary) | | | | | | | | | || (image-coding=[MH,MR]) x| 0| 1| | | | | | 0| 0||(& (color=binary) | | | | | | | | | || (image-coding=[MH,MMR]) x| 1| 1| | | | | | 0| 0||(& (color=binary) | | | | | | | | | || (image-coding=[MH,MR,MMR]) x| 0| 0| | | | | | 1| 0||(& (color=binary) | | | | | | | | | || (image-coding=[MH,JBIG]) | | | | | | | | | || (image-coding-constraint=JBIG-T85) | | | | | | | | | || (JBIG-stripe-size=128) ) x| 1| 0| | | | | | 1| 0||(& (color=binary) | | | | | | | | | || (image-coding=[MH,MR,JBIG]) | | | | | | | | | || (image-coding-constraint=JBIG-T85) | | | | | | | | | || (JBIG-stripe-size=128) ) x| 0| 1| | | | | | 1| 0||(& (color=binary) | | | | | | | | | || (image-coding=[MH,MMR,JBIG]) | | | | | | | | | || (image-coding-constraint=JBIG-T85) | | | | | | | | | || (JBIG-stripe-size=128) ) x| 1| 1| | | | | | 1| 0||(& (color=binary) | | | | | | | | | || (image-coding=[MH,MR,MMR,JBIG]) | | | | | | | | | || (image-coding-constraint=JBIG-T85) | | | | | | | | | || (JBIG-stripe-size=128) ) x| 0| 0| | | | | |*1| 1||(& (color=binary) | | | | | | | | | || (image-coding=[MH,JBIG]) | | | | | | | | | || (image-coding-constraint=JBIG-T85) | | | | | | | | | || (JBIG-stripe-size>=0) ) x| 1| 0| | | | | |*1| 1||(& (color=binary) | | | | | | | | | || (image-coding=[MH,MR,JBIG]) | | | | | | | | | || (image-coding-constraint=JBIG-T85) | | | | | | | | | || (JBIG-stripe-size>=0) ) x| 0| 1| | | | | |*1| 1||(& (color=binary) | | | | | | | | | || (image-coding=[MH,MMR,JBIG]) | | | | | | | | | || (image-coding-constraint=JBIG-T85) | | | | | | | | | || (JBIG-stripe-size>=0) ) x| 1| 1| | | | | |*1| 1||(& (color=binary) | | | | | | | | | || (image-coding=[MH,MR,MMR,JBIG]) | | | | | | | | | || (image-coding-constraint=JBIG-T85) | | | | | | | | | || (JBIG-stripe-size>=0) )--+--+--+--+--+--+--+--+--+--++---------------------------------------McIntyre & Klyne Informational [Page 20] RFC 2880 Internet Fax T.30 Feature Mapping August 20005.1.2 Multi-level coding<------- T.30 bits --------->15|16|31|36|37|68|69|73|78|79||Feature set expression--+--+--+--+--+--+--+--+--+--++--------------------------------------- x| | |*0| x| 0| x| x| | ||*1| | | 0| x| 1| 0| x| | ||(& (color=grey) | | | | | | | | | || (image-coding=JPEG) | | | | | | | | | || (image-coding-constraint=JPEG-T4E) )*1| | | 0| x| 1| 1| 0| | ||(& (color=[grey,full]) | | | | | | | | | || (image-coding=JPEG) | | | | | | | | | || (image-coding-constraint=JPEG-T4E) | | | | | | | | | || (& (color=full) | | | | | | | | | || (color-subsampling="4:1:1") ) )*1| | | 0| x| 1| 1| 1| | ||(& (color=[grey,full]) | | | | | | | | | || (image-coding=JPEG) | | | | | | | | | || (image-coding-constraint=JPEG-T4E) | | | | | | | | | || (& (color=full) | | | | | | | | | || (color-subsampling= | | | | | | | | | || ["1:1:1","4:1:1"]) ) )*1| | | 1| 0|*1| 0| x| | ||(& (color=grey) | | | | | | | | | || (image-coding=[JPEG,JBIG]) | | | | | | | | | || (image-coding-constraint= | | | | | | | | | || [JPEG-T4E,JBIG-T43]) | | | | | | | | | || (image-interleave=stripe) )*1| | | 1| 1|*1| 0| x| | ||(& (color=grey) | | | | | | | | | || (image-coding=[JPEG,JBIG]) | | | | | | | | | || (image-coding-constraint= | | | | | | | | | || [JPEG-T4E,JBIG-T43]) | | | | | | | | | || (image-interleave=[stripe,plane]) )*1| | | 1| 0|*1| 1| 0| | ||(& (color=[limited,mapped,grey,full]) | | | | | | | | | || (image-coding=[JPEG,JBIG]) | | | | | | | | | || (image-coding-constraint= | | | | | | | | | || [JPEG-T4E,JBIG-T43]) | | | | | | | | | || (& (color=full) | | | | | | | | | || (color-subsampling="4:1:1"]) ) | | | | | | | | | || (image-interleave=stripe) )*1| | | 1| 0|*1| 1| 1| | ||(& (color=[limited,mapped,grey,full]) | | | | | | | | | || (image-coding=[JPEG,JBIG]) | | | | | | | | | || (image-coding-constraint= | | | | | | | | | || [JPEG-T4E,JBIG-T43]) | | | | | | | | | || (& (color=full) | | | | | | | | | || (color-subsampling= | | | | | | | | | || ["1:1:1","4:1:1"]) ) | | | | | | | | | || (image-interleave=stripe) )McIntyre & Klyne Informational [Page 21] RFC 2880 Internet Fax T.30 Feature Mapping August 2000*1| | | 1| 1|*1| 1| 0| | ||(& (color=[limited,mapped,grey,full]) | | | | | | | | | || (image-coding=[JPEG,JBIG]) | | | | | | | | | || (image-coding-constraint= | | | | | | | | | || [JPEG-T4E,JBIG-T43]) | | | | | | | | | || (& (color=full) | | | | | | | | | || (color-subsampling="4:1:1"]) ) | | | | | | | | | || (image-interleave=[stripe,plane]) )*1| | | 1| 1|*1| 1| 1| | ||(& (color=[limited,mapped,grey,full]) | | | | | | | | | || (image-coding=[JPEG,JBIG]) | | | | | | | | | || (image-coding-constraint= | | | | | | | | | || [JPEG-T4E,JBIG-T43]) | | | | | | | | | || (& (color=full) | | | | | | | | | || (image-coding=JPEG) | | | | | | | | | || (color-subsampling= | | | | | | | | | || ["1:1:1","4:1:1"]) ) | | | | | | | | | || (image-interleave=[stripe,plane]) )--+--+--+--+--+--+--+--+--+--++---------------------------------------15|16|31|36|37|68|69|73|78|79||--+--+--+--+--+--+--+--+--+--++---------------------------------------5.1.3 MRC format<---- T.30 bits ------>15|92|93|94|95| | | ||Feature set expression--+--+--+--+--+--+--+--++--------------------------------------- x| 0| 0| 0| x| | | ||(MRC-mode=0)*1| #| #| #| 0| | | ||(& (MRC-mode<=###) | | | | | | | || (MRC-max-stripe-size=[0..256]) )*1| #| #| #| 1| | | ||(& (MRC-mode<=###) | | | | | | | || (MRC-max-stripe-size>=0) )--+--+--+--+--+--+--+--++---------------------------------------McIntyre & Klyne Informational [Page 22] RFC 2880 Internet Fax T.30 Feature Mapping August 20005.2 Resolution and units<------- T.30 bits ------>15|41|42|43|44|45|68|97|98||Feature set expression--+--+--+--+--+--+--+--+--++----------------------------------------- 0| | | 0| | | | | ||(& (color=binary) | | | | | | | | || (| (& (dpi=200) (dpi-xyratio=200/100) ) | | | | | | | | || (& (dpi=204) | | | | | | | | || (dpi-xyratio=204/98) ) ) ) | | | | | | | | || 1| | | 0| | | | | ||(| (& (color=binary) | | | | | | | | || (| (& (dpi=204) | | | | | | | | || (dpi-xyratio=204/98) ) | | | | | | | | || (& (dpi=204) | | | | | | | | || (dpi-xyratio=204/196) ) | | | | | | | | || (& (dpi=200) | | | | | | | | || (dpi-xyratio=200/100) ) ) ) | | | | | | | | || (& (dpi=200) (dpi-xyratio=1) ) ) 0| | | 1| | | | | ||(| (& (color=binary) | | | | | | | | || (| (& (dpi=204) | | | | | | | | || (dpi-xyratio=204/98) ) | | | | | | | | || (& (dpi=408) | | | | | | | | || (dpi-xyratio=408/391) ) | | | | | | | | || (& (dpi=200) | | | | | | | | || (dpi-xyratio=200/100) ) ) ) | | | | | | | | || (& (dpi=400) (dpi-xyratio=1) ) ) 1| | | 1| | | | | ||(| (& (color=binary) | | | | | | | | || (| (& (dpi=204) | | | | | | | | || (dpi-xyratio=204/98) ) | | | | | | | | || (& (dpi=204) | | | | | | | | || (dpi-xyratio=204/196) ) | | | | | | | | || (& (dpi=408) | | | | | | | | || (dpi-xyratio=408/391) ) | | | | | | | | || (& (dpi=200) | | | | | | | | || (dpi-xyratio=200/100) ) ) ) | | | | | | | | || (& (dpi=200) (dpi-xyratio=1) ) | | | | | | | | || (& (dpi=400) (dpi-xyratio=1) ) )--+--+--+--+--+--+--+--+--++----------------------------------------- | 0| | | | | | | || | 1| | | | | | | ||(& (color=binary) | | | | | | | | || (dpi=204) | | | | | | | | || (dpi-xyratio=204/391) )--+--+--+--+--+--+--+--+--++----------------------------------------- | | 0| | | | | | || | | 1| | | | | | ||(& (dpi=300) (dpi-xyratio=1) )McIntyre & Klyne Informational [Page 23] RFC 2880 Internet Fax T.30 Feature Mapping August 2000--+--+--+--+--+--+--+--+--++----------------------------------------- | | x| x| | | x| 0| || | | x| 1| | |*1| 1| ||(& (dpi=400) (dpi-xyratio=1) ) | |*1| 0| | |*1| 1| ||--+--+--+--+--+--+--+--+--++----------------------------------------- | | | | | | x| | 0|| | | | | | |*1| | 1||(| (color=binary) | | | | | | | | || (& (color=[limited,mapped,grey,full]) | | | | | | | | || (dpi=100) (dpi-xyratio=1) ) )--+--+--+--+--+--+--+--+--++-----------------------------------------15|41|42|43|44|45|68|97|98||--+--+--+--+--+--+--+--+--++----------------------------------------- Note: all numbers in media feature expressions are integer or rational values; hence the rational number format (n/m) used here. Also note: the preferred unit bits (44,45) are not tested here, as a Group 3 fax machine must accept and process either form of units for binary images. All resolutions are expressed in dpi; here are the metric unit equivalents: 204 ~= (1728/215)*25.4 ~= 8.04dpmm expressed in dpi 408 ~= (3456/215)*25.4 ~= 16.08dpmm expressed in dpi 98 ~= 3.85*25.4 ~= 3.85dpmm expressed in dpi 196 ~= 7.70*25.4 ~= 7.70dpmm expressed in dpi 391 ~= 15.40*25.4 ~= 15.40dpmm expressed in dpi5.3 Colour capabilities<------- T.30 bits --->36|68|69|71|74|75| | ||Feature set expression--+--+--+--+--+--+--+--++----------------------------------------- 0| 0| x| | | | | || x| 1| 0| | | | | ||(| (color=binary) | | | | | | | || (& (color=grey) | | | | | | | || (color-space=CIELAB) ) ) 0| 1| 1| | | | | ||(| (color=binary) | | | | | | | || (& (color=[grey,full]) | | | | | | | || (color-space=CIELAB) ) ) 1|*1| 1| | | | | ||(| (color=binary) | | | | | | | || (& (color=limited) | | | | | | | || (color-space=[Device-RGB,Device-CMY]) | | | | | | | || (color-levels<=8) ) | | | | | | | || (& (color=limited) | | | | | | | || (color-space=Device-CMYK) | | | | | | | || (color-levels<=16) ) | | | | | | | || (& (color=[mapped,grey,full]) | | | | | | | || (color-space=CIELAB) ) )McIntyre & Klyne Informational [Page 24] RFC 2880 Internet Fax T.30 Feature Mapping August 2000--+--+--+--+--+--+--+--++----------------------------------------- | 0| | x| | | | || | 1| | 0| | | | ||(| (color=[binary,limited]) | | | | | | | || (& (color=mapped) | | | | | | | || (color-levels<=4096) ) | | | | | | | || (& (color=grey) | | | | | | | || (color-levels<=256) ) | | | | | | | || (& (color=full) | | | | | | | || (color-levels<=16777216) ) ) | 1| | 1| | | | ||(| (color=[binary,limited]) | | | | | | | || (& (color=mapped) | | | | | | | || (color-levels<=65536) ) | | | | | | | || (& (color=grey) | | | | | | | || (color-levels<=4096) ) | | | | | | | || (& (color=full) | | | | | | | || (color-levels<=68719476736) ) )--+--+--+--+--+--+--+--++----------------------------------------- | 0| | | x| | | || | 1| | | 0| | | ||(| (color=[binary,limited]) | | | | | | | || (& (color=[mapped,grey,full]) | | | | | | | || (color-illuminant=D50) ) ) | 1| | | 1| | | || -- Any color illuminant: D50 or custom | | | | | | | || -- See note below--+--+--+--+--+--+--+--++----------------------------------------- | 0| | | | x| | || | 1| | | | 0| | ||(| (color=[binary,limited]) | | | | | | | || (& (color=grey) | | | | | | | || (CIELAB-L-min>=0) | | | | | | | || (CIELAB-L-max<=100) ) | | | | | | | || (& (color=[mapped,full]) | | | | | | | || (CIELAB-L-min>=0) | | | | | | | || (CIELAB-L-max<=100) | | | | | | | || (CIELAB-a-min>=-85) | | | | | | | || (CIELAB-a-max<=85) | | | | | | | || (CIELAB-b-min>=-75) | | | | | | | || (CIELAB-b-max<=125) ) ) | 1| | | | 1| | || -- Any color gamut: default or custom--+--+--+--+--+--+--+--++-----------------------------------------36|68|69|71|74|75| | ||Feature set expression--+--+--+--+--+--+--+--++----------------------------------------- NOTE: the above table assumes the registration of a feature tag for color illuminant, values of which are tokens that are the same as those described by ITU T.4 [7], Annex E, section E.6.7.McIntyre & Klyne Informational [Page 25] RFC 2880 Internet Fax T.30 Feature Mapping August 20005.4 Document size A4 width (215mm) is required as a minimum for Group 3 fax conformance. A Group 3 fax machine must always be able to receive an A4 image.<---- T.30 bits ------>17|18|19|20|76|77| | ||Feature set expression--+--+--+--+--+--+--+--++----------------------------------------- 0| 0| | | | | | ||(Size-x <= 2150/254) 1| 0| | | | | | ||(Size-x <= 2550/254) x| 1| | | | | | ||(Size-x <= 3030/254)--+--+--+--+--+--+--+--++----------------------------------------- | | 0| 0| | | | ||(Size-y <= 2970/254) | | 1| 0| | | | ||(Size-y <= 3640/254) | | 0| 1| | | | || -- unlimited | | 1| 1| | | | || -- invalid--+--+--+--+--+--+--+--++----------------------------------------- | | | | 0| 0| | ||(Paper-size=A4) | | | | 1| 0| | ||(Paper-size=[A4,Letter]) | | | | 0| 1| | ||(Paper-size=[A4,Legal]) | | | | 1| 1| | ||(Paper-size=[A4,Letter,Legal])⌨️ 快捷键说明
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