Hi Marti and all,
We have a case where we have a grayscale image expressed as 4 values per
pixel, the first three are channels, identical to one another,
representing the grayscale value, while the fourth is Alpha. You could
describe this as GGGA. The image has a grayscale profile.
We wou
On 28/09/2015 21:33, Kunda wrote:
What is the status of Python bindings for lcms2?
Is anyone working on this?
Hi, this is rather late, but if you haven't anything else you could try the
SWIG bindings at https://pypi.python.org/pypi/littlecms/0.1b1. The
documentation is lacking but it's mostly
On 28 September 2015 at 21:33, Kunda wrote:
> What is the status of Python bindings for lcms2?
It's not exactly the same, and is probably only an option on Linux,
but libcolord has an API that wraps the important parts of lcms2 and
provides a nice GObjectIntrospection interface that can be easily
What is the status of Python bindings for lcms2?
Is anyone working on this?
Cheers,
/Kunda
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János, Tóth F. wrote:
> - The Relative colorimetric and Preceptual intents won't correct my white
> balance.
They won't, since they are white point relative. The assumption is that
you (the viewer) are fully adapted to the white point.
> - The Absolute colorimetric intent is often buggy (absolute
I am currently playing with 10 bit/color capable hardwares (FirePro V5700
and Dell U2410).
My half-proven theory was that I can achieve significantly better results
when I skip the calibration (new VGAs, like my other one a HD5850,
which is unable to send out 10 bit from the framebuffers (driv
Mark,
The internal logic is complex, an V4 profile implemented
as matrix shaper do have a zero black point, which is not
the case if the profile is implemented by using LUTs.
That was already implemented in lcms 1. Lcms 2 behaves
as lcms 1 in the cases lcms 1 is right.
But I think you have not t
Hi Marti
I saved the sRGB input profile and see I'ts labelled as V4.2. So, what's the
logic followed by LCMS?
Something like, if no Black Point is defined assume it's X=Y=Z = 0 and scale
that to be L*=3. Otherwise scale the Black Point.
Is there a way to make LCMS2 behave like LCMS1 or will it
Hi Mark,
That's black point compensation, V4 perceptual and saturation
have non-zero black points. sRGB built-in is basically a V2
profile, so for going from V2 black (which is zero) to v4 black
(which is about L*=3) we need some sort of scaling.
Regards
Marti
Quoting Mark :
> Hi Marti
>
> lo
Hi Marti
looking at the stages created for a sRGB -> XYZ transform I see 3 stages are
generated
- curve set stage for the gamma curves
- matrix float stage converting device rgb to xyz (I see the matrix is scaled
so by 1/MAX_ENCODEABLE_XYZ)
- a second matrix including offset:
Offset:
Hi Marti,
sorry for late response. I will wait for the next update. Will it be
something between 1.18 and 2.0 or 2.0?
Thanks for help and
regards,
Wolfgang
Am 09.09.2009 um 15:50 schrieb [email protected]:
>
>>> The Error #3000 "Invalid PCS" raises by calling
>>> "cmsCreateMultipr
Hi,
> sorry for late response. I will wait for the next update. Will it be
> something between 1.18 and 2.0 or 2.0?
Yes. It will be a 1.19 with bugfixes (including this one) and because
an issue found on the license wording. No new functionality will be
added to 1.xx branch anymore, but I don'
> is there a possibility to control "cmsCreateInkLimitingDeviceLink" in
> sense of GCR or UCR?
> Is the actual generation GCR or UCR?
> I couldn't find anything.
It uses the hypercube algorithm, which is a sort of under color removal.
Basically it reduces proportionally CMY if (and only if) bla
>> The Error #3000 "Invalid PCS" raises by calling
>> "cmsCreateMultiprofileTransform".
>> If I create same kind of transformations from RGB to CMYK or from
>> CMYK to CMYK, there raises no error.
>> Is this in v1.18 or later the same?
>> What I do wrong and what could be a solution?
>
Congra
Hi,
is there a possibility to control "cmsCreateInkLimitingDeviceLink" in
sense of GCR or UCR?
Is the actual generation GCR or UCR?
I couldn't find anything.
If an ICC input profile is GCR or UCR and as next the ink limit
device link follows in the transformation chain, what does the actual
Hi Marti,
Question was:
> I am writing a Pascal RIP software and have to create
transformations for
> proofing and if necessary add ink limiting.
> In some circumstances there is the need to convert XYZ with
proofing and
> ink limiting to CMYK. But that generates an LCMS error.
> I am work
Hi,
That may be a bug, but it is hard to follow the code for me. May I ask you
to try to reproduce the issue by using icclink? That would make easier to
uncover the source of the mistake.
Thanks for reporting.
Regards
Marti.
On 01/09/2009 14:42:26, Wolfgang Huß ([email protected]) wrote:
Hi All,
I am writing a Pascal RIP software and have to create transformations
for proofing and if necessary add ink limiting.
In some circumstances there is the need to convert XYZ with proofing
and ink limiting to CMYK. But that generates an LCMS error.
I am working still with Lcms v1.13.
T
[email protected] wrote:
>
> Hi Michel.
>
> If you use icctrans in such way, you are converting from sRGB (v4)
> to the internal sRGB (v2), and a RGB value of (0, 0, 0) is correctly
> converted to (0, 0, 0).
>
> You may way to inspect the PCS. icctrans shows teh v2 PCS
> when using -v Bu
Hi Michel.
If you use icctrans in such way, you are converting from sRGB (v4)
to the internal sRGB (v2), and a RGB value of (0, 0, 0) is correctly
converted to (0, 0, 0).
You may way to inspect the PCS. icctrans shows teh v2 PCS
when using -v But then there are important differences between
V2 a
Hello list..
If I understand v4 specs (and related documents) correctly, perceptual
intent in v4 profiles should re-render to PRMG (at profile build time,
so generated LUTs take into account intermediate reference gamut), or at
the very least scale white and black points to PRM's white and bla
Lorenzo Ridolfi wrote:
> In the current implementation, you only can get a fully adapted viewing
> condition with a high value for LA. IMHO, having a high LA, has impacts
> in the “non linear compression”. My question, is there any situation
> when you need a fully adapted viewer and a low LA?
vi
Hi,
Browsing the LCMS code related to CIECAM02, I notice the "D value" used in
CIECAM02 chromatic adaptation is always calculated in cmsCIECAM02Init.
There's no option to simple set D = 1.0 and assume the viewer is fully
adapted. If you use the default viewing conditions and set La to 100.0, D
IL PROTECTED]>
To:
Sent: Thursday, June 30, 2005 9:48 PM
Subject: [Lcms-user] Question regarding used LONGLONG define
Hi,
I found the define LONGLONG either u_int64_t or unsigned long long in
lcms.h.
As I know (on windows) LONGLONG should be a signed value, the ULONGLONG is
used for unsigne
Hi,
I found the define LONGLONG either u_int64_t or unsigned long long in
lcms.h.
As I know (on windows) LONGLONG should be a signed value, the ULONGLONG is
used for unsigned (defined in winnt.h, oledb.h and wtypes.h as __int64).
I compile 64bit adress compatible and using the LONGLONG / ULONGLONG
"Stinehour, Judith E" <[EMAIL PROTECTED]>
To: "'Marti Maria'" <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>; "Stinehour, Judith E" <[EMAIL PROTECTED]>
Sent: Thursday, June 10, 2004 3:45 PM
Subject: [Lcms-user] question
Marti,
We are co
Marti,
We are compiling lcms on Beta Solaris X86 and
The compiler is giving us the following warnings on every line
Where you define
icMaxEnumTag= 0xL
in file "icc34.h", line 330: warning: enumerator value overflows INT_MAX
(2147483647)
Do you have a preferre
PROTECTED]
- Original Message -
From: "Ilja Fiers" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, February 26, 2003 2:05 PM
Subject: [Lcms-user] Question using planar configuration
> Hello Marti & all lcms users,
>
> First of all, tha
Hello Marti & all lcms users,
First of all, thanks for a great product, it is very well written and
usefull! I have got a question about using the lcms engine in planar
configuration. What i would like to do is offer the engine RGB data, and get
a planar result back. But maybe i misinterpreted the
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