Colorspace ... again

I have a few simple questions which, I hope, will clear my mind:
1. Is LR always working in ProPhotoRGB colorspace?
2. Is this true no matter what the input files are (JPEG-sRGB or RAW-AdobeRGB)?
3. Does that mean that it always lets me work with a wider gamut then the input file has, and that any possible output has?
4. If that's true, how doest this make sense?
Thanks for your help in understanding and start to think the 'LR-way'
Franz

>On the input side, LR does always use the 'widest' possible color space, but never 'wider' than the actual color space of the source is (if any).
Lightroom uses the 16-bit linear prophotoRGB space (they call it melissaRGB) for all its processing regardless of the source. So a source file, if not a RAW image, will be rendered into this space using its source profile and then all the changes will be applied to that. The reason behind this is simplicity and the fact that it is fairly easy to make colors fall outside of the narrower spaces, even if you start with a source in sRGB. prophotoRGB is often necessary because even cheap inkjets can reproduce colors outside of adobeRGB. Even the printers at costco can produce colors outside adobeRGB. See http://lagemaat.blogspot.com/2007/11/relevant-example-for-pprgb-vs-adobergb.html The situation is even worse for higher end inkjets.
P.S. the working space is really not an issue for anything. As long as it is wider than anything you put into it and it is of enough precision, you should not even think about it. Storage space is not an issue as the rendering into Lightroom's color space is transient anyway and Lightroom only stores the originals and a list of edits and jpeg previews. As you found, Lightroom will simply convert to the other narrower working spaces if you need those and will convert to printing profiles.

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Hi! I am new to the forum and have a strange question. I shoot with a Canon 40 in Adobe rgb color space. I import all the images into lightroom and sometimes I edit in PS (CS4). When I choose "edit in PS4" from lightroom, the color profile is Pro Photo and not adobe RGB.
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Help?

Check your Color Settings in Photoshop and select "Ask when opening" in your RGB settings. It could be that ProPhoto RGB is setup as your Photoshop RGB workspace, but I think you can change it to Adobe RGB there. You might also be able to set it in Bridge as your default RGB colorspace. I like the option of using "Ask when opening" in case I want to use ProPhoto on certain types of files and Adobe RGB on others.

PDEXGroup to set the Page Group ColorSpace

Hello,
I'm currently trying to add an Image into a PDF (that's the only content) but as I read on previous threads I'm trying to get a correct rendering when there is an alpha (channel/mask) in my image.
To do so I first create an Image (PDEImageCreate) then I create the Alpha mask and apply it to the first image (using PDEImageSetSMask).
The problem is now my image is too dark in "Acrobat Reader" and is correct in Evince. So I guess my problem is Acrobat try to blend in CMYK but my source image is in RGB.
But I don't really understand how I should/could specify that ? I tried in the Resources of the Page, and then I tried the PDEXGroup, but how can I add my XObject to the PDEXGroup ?
Am I on the wrong track trying to set the Page ColorSpace ?
Thanks in advance.

Following your indication I re-read the paragraph relating to Transparency group. starting with the 11.4.7.
All of the elements painted directly onto a page—both top-level groups and top-level objects that are not part of any group—shall be treated as if they were contained in a transparency group P
My main question here is how do I get access to this "group P" ?
Because I didn't found how, I searched "how to specify a blending" which leads me to paragrap 11.6.3
11.6.3    Specifying Blending Colour Space and Blend Mode The blending colour space shall be an attribute of the transparency group within which an object is painted; its specification is described in 11.6.6, "Transparency Group XObjects."
Ok so how to define a Transparency group is in 11.6.6 (still my original question)
Summarized : a transparency group is a specialized form XObject with a Group entry in its dictionnary. (Group with subtype "/S /Transparency") Also a Page may have a Group entry (some entries in this dictionnary may be interpreted differently when in a Page group).
So (again) I looked at the right paragraph to make a Group 8.10.3, "Group XObjects".
This paragraph finally describe what the CosObj should look like I expect it to be something like :
6 0 obj                                % Form XObject
   << /Type /XObject
      /Subtype /Form
      /FormType 1
      /BBox [ 0 0 1000 1000 ]
      /Group <>      /Matrix [ 1 0 0 1 0 0 ]
      /Resources << /ProcSet [ /PDF ] >>      /Length 58
    >>stream
endstream
endobj
But alas my main concern is still here, how do I add a PDEImage in a PDEGroup or PDEForm or CosObj and then overwrite the Page content with this new content in order to change the default Blending ColorSpace ?
You said to use the Cos API but what the Cos Object should look likes when the Color Blend Space is correctly set ?
Below there is some code sample that I used to get this working.
1 void func()
2 {
3         PDDoc       document;
4         PDPage      page;
5         ASFixedRect mediabox;
6         PDEContent content;
7
8         /* Some or most informations are skipped below for readability but important
9          * call remains
10          */
11
12         document = PDDocCreate();
13
14         page     = PDDocCreatePage(document, PDBeforeFirstPage, mediabox);
15         content = PDPageAcquirePDEContent(page, NULL);
16
17         /* setup arguments PDEImage */
18         image    = PDEImageCreate(....);
19         /* setup arguments for Image mask / alpha channel */
20         mask     = PDEImageCreate(....);
21
22         PDEImageSetMatteArray(mask, ...);
23         PDEImageSetSMask(image, mask);
24
25         CosDoc documentCos = PDDocGetCosDoc(document);
26         CosObj xobjForm = CosNewNull();
27         CosObj resources = CosNewNull();
28
29         /*
30          * Here is the naive version I first tried which as you explained should be
31          * done using Cos_Layer functions
32          */
33 #if defined NAIVE_VERSION
34
35         /*
36          * Doesn't work
37          */
38
39         CosObj imgCos;
40         PDEImageGetCosObj(img, &imgCos);
41         PDEXGroup grp_image = PDEXGroupCreateFromCosObj(&imgCos);
42         PDEXGroupSetColorSpace(grp_image, PDEColorSpaceCreateFromName(ASAtomFromString("DeviceRGB")));
43
44         PDEContentAddElem(content, kPDEAfterLast, image);
45         PDPageSetPDEContent(page, content);
46
47 #elif defined SECOND_VERSION
48
49         /*
50          * Doesn't work
51          */
52
53
54         PDEContentAddElem(content, kPDEAfterLast, image);
55
56         PDEForm myf = NULL;
57
58         PDEContentAttrs pdeContentAttrs;
59         memset(&pdeContentAttrs, 0, sizeof pdeContentAttrs);
60         PDEContentGetAttrs(content, &pdeContentAttrs, sizeof pdeContentAttrs);
61
62         PDEContentToCosObj(content, kPDEContentToForm, &pdeContentAttrs,
63                 sizeof pdeContentAttrs, documentCos, NULL, &xobjForm, &resources);
64
65         if (!CosObjEqual(xobjForm, CosNewNull()) && !CosObjEqual(resources, CosNewNull())) {
66             /* success retrieving form & resources */
67
68             // Put resources into the Form XObject stream dictionary
69             CosDictPutKeyString(xobjForm, "Resources" , resources);
70
71             // Set BBox key for the Form XObject according to the image page
72             ASFixedRect rectOrigPage;
73             PDPageGetMediaBox(page, &rectOrigPage);
74
75             CosObj BBoxArray = CosNewArray(documentCos, 4, false);
76             CosArrayPut(BBoxArray, 0, CosNewInteger(documentCos, false, ASFixedRoundToInt16(rectOrigPage.left)));
77             CosArrayPut(BBoxArray, 1, CosNewInteger(documentCos, false, ASFixedRoundToInt16(rectOrigPage.bottom)));
78             CosArrayPut(BBoxArray, 2, CosNewInteger(documentCos, false, ASFixedRoundToInt16(rectOrigPage.right)));
79             CosArrayPut(BBoxArray, 3, CosNewInteger(documentCos, false, ASFixedRoundToInt16(rectOrigPage.top)));
80
81             CosDictPutKeyString(xobjForm, "BBox" , BBoxArray);
82
83             // Set matrix key for the Form XObject
84             ASFixedMatrix defaultMatrix;
85             PDPageGetDefaultMatrix(page, &defaultMatrix);
86
87             myf = PDEFormCreateFromCosObj(&xobjForm, &resources, &defaultMatrix);
88
89             PDEXGroup trpgroup = PDEXGroupCreate(documentCos, kPDEXGroupTypeTransparency);
90             PDEXGroupSetColorSpace(trpgroup, PDEColorSpaceCreateFromName(ASAtomFromString("DeviceRGB")));
91
92             PDEFormSetXGroup(myf, trpgroup);
93             PDEContentAddElem(content, kPDEBeforeFirst, (PDEElement) myf);
94
95             PDPageSetPDEContent(page, (ASExtension) PDEFormGetContent(myf));
96         }
97
98 #else
99
100         /*
101          * Doesn't work
102          */
103
104         CosObj xobjForm = (CosObj) CosNewDict(documentCos, false, 1);
105         CosObj resources = (CosObj) CosNewDict(documentCos, false, 1);
106
107         CosDictPutKeyString(xobjForm, "Type", CosNewName(documentCos, false, ASAtomFromString("XObject")));
108         CosDictPutKeyString(xobjForm, "Subtype", CosNewName(documentCos, false, ASAtomFromString("Form")));
109         CosDictPutKeyString(xobjForm, "FormType", CosNewInteger(documentCos, false, 1));
110
111         CosObj array_bbox = CosNewArray(documentCos, false, 4);
112         CosArrayPut(array_bbox, 0, CosNewInteger(documentCos, false, 0));
113         CosArrayPut(array_bbox, 1, CosNewInteger(documentCos, false, 0));
114         CosArrayPut(array_bbox, 2, CosNewInteger(documentCos, false, width));
115         CosArrayPut(array_bbox, 3, CosNewInteger(documentCos, false, height));
116
117         CosDictPutKeyString(xobjForm, "BBox", array_bbox);
118
119         ASFixedMatrix frmMatrix;
120         frmMatrix.a = FloatToASFixed(1);
121         frmMatrix.d = FloatToASFixed(1);
122         frmMatrix.b = frmMatrix.c = frmMatrix.h = frmMatrix.v = fixedZero;
123
124 #endif
125
126         PDDocSave(document, ....);
127
128 }
Thanks again for your help.

Converting from RGB colorSpace to cs_gray

Pls can anybody help with the conversion from sRGB to cs_GRAY
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I have a pdf file I need to send out to members via a link in an email.
This file will not open using the link. The error message I get is:
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I am not sure if this is the right way to seek help for this error. If not, please re-direct me so I can join this thread.
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One question on ColorSpace usage via SDk

Hi,
If particular element uses ColorSpace - then I see structure like this:
/CS0 cs 0 scn
Is it possible via PDE layer to change that 0 value to 1 right after "cs" token? Or do I need again to dive into Cos?

Hi Aandi,
After doing all those tests - I've actually found that PDEElementCopy works with an ERROR!
I've used CosStream to see what is inside my PDEContainer's PDEContent before PDEElementCopy operation:
origContent(Indir 30 0 R)
origContent(InDir Stream::)**
Stream offset: 62145; Stream length: 410
(Dir dict::)**
TAG: (Dir name - value == Length)
(Dir integer - val == 410)
q
0 283.465 283.465 -283.465 re
W n
q
1 0 0 1 -8.8535004 134.4385071 cm
/CS0 cs 1 scn
1 i
/GS0 gs
0 0 m
0 82.438 66.83 149.268 149.267 149.268 c
231.705 149.268 298.535 82.438 298.535 0 c
298.535 -82.438 231.705 -149.267 149.267 -149.267 c
66.83 -149.267 0 -82.438 0 0 c
f
Q
Q
q
23.846 48.562 160.373 160.37 re
W n
q
0 g
1 i
/GS0 gs
-160.3720093 0 0 160.3720093 184.2041016 128.7929688 cm
BX /Sh0 sh EX Q
Q
And after:
copyContent(Indir 31 0 R)
copyContent(InDir Stream::)**
Stream offset: 62555; Stream length: 393
(Dir dict::)**
TAG: (Dir name - value == Length)
(Dir integer - val == 393)
q
0 283.465 283.465 -283.465 re
W n
q
1 0 0 1 -8.8535004 134.4385071 cm
/CS0 cs 1 scn
1 i
/GS0 gs
0 0 m
0 82.438 66.83 149.268 149.267 149.268 c
231.705 149.268 298.535 82.438 298.535 0 c
298.535 -82.438 231.705 -149.267 149.267 -149.267 c
66.83 -149.267 0 -82.438 0 0 c
f
Q
Q
q
23.846 48.562 160.373 160.37 re
W n
q
-160.3720093 0 0 160.3720093 184.2041016 128.7929688 cm
BX /Sh0 sh EX Q
Q
As you could see in copy version we have an absence of these lines:
0 g
1 i
/GS0 gs
Why??? I don't know. Maybe it's a bug in SDK... So that was workarounded with CosStreams instead.
Now in regards to CosStream "attach" - for me it was not obvious (from API documentation and samples code) if I could create PDEContainer's PDEContent from CosStream as well, but now I have:
myNewContent = PDEContentCreateFromCosObj (&cStmObj, &oTmpRes);
PDEContainerSetContent(myNewContainer, myNewContent);
and it works perfectly for me.
Now in regards to that "/CS0 cs 1 scn" sequence - you could see it inside my initial CosStream. So while I wanted to create new special marks with SPOT color - I needed to preserve that as well. And didn't find how besides again CosStream tokens parcing and replacing 0 to 1 where needed. I hope there is a better way for that...
Does all of that clarify my thoughts?
Andrejus

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Colorspace ... again

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