Re: Step-by-step through a CLUT...
Re: Step-by-step through a CLUT...
- Subject: Re: Step-by-step through a CLUT...
- From: Graeme Gill <email@hidden>
- Date: Thu, 18 Oct 2007 02:17:32 +1000
Mark wrote:
Now, I wonder what section 10.10 lutAtoBType (tag 'mAB ') is used for.
I could not find any input or output profile that uses these tags -
does anybody have such a profile?
There are 4 clut type tag types:
lut16type (10.8), lut8type (10.9), lutAtoBtype (10.10), lutBtoAtype (10.11).
The first two are V2 tag types, the second two are V4 tag types.
They can be used for a variety of tags:
AToB0Tag (9.2.1) Allowed tag types: lut8Type or lut16Type or lutAtoBType
AToB1Tag (9.2.2) Allowed tag types: lut8Type or lut16Type or lutAtoBType
AToB2Tag (9.2.3) Allowed tag types: lut8Type or lut16Type or lutAtoBType
BToA0Tag (9.2.6) Allowed tag types: lut8Type or lut16Type or lutBtoAType
BToA1Tag (9.2.7) Allowed tag types: lut8Type or lut16Type or lutBtoAType
BToA2Tag (9.2.8) Allowed tag types: lut8Type or lut16Type or lutBtoAType
gamutTag (9.2.18) Allowed tag types: lut8Type or lut16Type or lutBtoAType
preview0Tag (9.2.28) Allowed tag types: lut8Type or lut16Type or lutBtoAType
preview1Tag (9.2.29) Allowed tag types: lut8Type or lut16Type or lutBtoAType
preview2Tag (9.2.30) Allowed tag types: lut8Type or lut16Type or lutBtoAType
Different profile classes use different combinations of tags :-
see table 21 on page 28 of the ICCV4.2 spec.
The most likely reason you haven't seen any lutAtoBType tag types
is that you haven't looked at enough V4 profiles, since of course,
V2 profiles do not contain them.
Graeme Gill.
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