Hi Tobias,
For what it's worth, since I'm already set up to do testing, I just
altered testcms2.c to use the following definition for a Float
XYZA->XYZA test step, modeled after the Float XYZ->XYZ test step,
including the cmsFLAGS_COPY_ALPHA flag to cause the Alpha value to be
passed through, and it passed with flying colors.
// XYZA to XYZA with preserve extra channels set
input = IdentityMatrixProfile( cmsSigXYZData);
# define TYPE_XYZA_FLT
(FLOAT_SH(1)|COLORSPACE_SH(PT_XYZ)|EXTRA_SH(1)|CHANNELS_SH(3)|BYTES_SH(4
))
xform = cmsCreateTransform( input, TYPE_XYZA_FLT, xyzProfile,
TYPE_XYZA_FLT, INTENT_RELATIVE_COLORIMETRIC, cmsFLAGS_COPY_ALPHA);
cmsCloseProfile(input);
cmsDoTransform( xform, in, out, 1);
cmsDeleteTransform( xform);
if (!IsGoodVal("Float XYZA->XYZA", in[0], out[0], FLOAT_PRECISSION)
||
!IsGoodVal("Float XYZA->XYZA", in[1], out[1], FLOAT_PRECISSION)
||
!IsGoodVal("Float XYZA->XYZA", in[2], out[2], FLOAT_PRECISSION)
||
!IsGoodVal("Float XYZA->XYZA", in[3], out[3],
FLOAT_PRECISSION))
return 0;
This suggests that what you need works just fine.
However, I don't know why Marti might have removed that definition from
the list. Perhaps back then, when there was no ability to copy alpha
values through (cmsFLAGS_COPY_ALPHA is a recent addition), it was deemed
unlikely to be needed. Nothing keeps you from defining it yourself, as
I did above.
-Noel
-----Original Message-----
From: Tobias Ellinghaus [mailto:m...@houz.org]
Sent: Tue, August 1, 2017 8:55 AM
To: lcms-user@lists.sourceforge.net
Subject: Re: [Lcms-user] Is TYPE_XYZA_FLT safe to use?
Sorry to bump this, but since the list came back to life recently I hope
that someone is able to answer this.
Am Dienstag, 30. Mai 2017, 12:16:48 CEST schrieb Tobias Ellinghaus:
> Hi,
>
> just a quick question: I want to use TYPE_XYZA_FLT in my code which is
still
> mentioned in the recent API documentation. However, it seems that it
was
> removed from lcms2 in 2.4 rc2
(d00163e17de9399a77138d035104ff1786d89d1d).
>
> Is there a reason not to use it? For the time being I can just #define
it
> myself the way it used to be done before, but maybe I am missing
something?
>
> Tobias
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