How to convert rgb image to cmyk?

[chongl43868165]

I tried 2 methods, none of them worked.

1:

1.     AVDoc avDoc = AVAppGetActiveDoc();
2.     PDDoc pdDoc = AVDocGetPDDoc(avDoc);
4.     PDColorConvertParams colorParams = (PDColorConvertParams) calloc( 1 , sizeof(PDColorConvertParamsRec) ); 
5.     PDColorConvertAction colorConvertAction = (PDColorConvertAction) calloc( 1 , sizeof( PDColorConvertActionRec ) ); 
6.     ASBool pageChanged = false; 
7.     AC_Profile  workingProfile;  
8.     ACGetWorkingSpaceProfile  (kACWorkingCMYK, &workingProfile); 
9. //Populate the PDColorConvertAction data members 
10.     colorConvertAction[0].mMatchAttributesAny = -1;//kColorConvObj_AnyObject; 
11.     colorConvertAction[0].mMatchSpaceTypeAny = -1;//kColorConvAnySpace; 
12.     colorConvertAction[0].mMatchIntent= AC_UseProfileIntent; 
13.     colorConvertAction[0].mConvertIntent = AC_UseProfileIntent; 
14.     colorConvertAction[0].mConvertProfile= workingProfile; 
15.     colorConvertAction[0].mEmbed = true; 
16.     colorConvertAction[0].mPreserveBlack = true; 
17.     colorConvertAction[0].mUseBlackPointCompensation= true; 
18.     colorConvertAction[0].mAction = kColorConvConvert; 
19.     colorConvertAction[0].mIsProcessColor = false; 
20.     colorParams->mActions = colorConvertAction; 
21.     colorParams->mNumActions = 1; 
22.     colorParams->mInks = NULL; 
23.     colorParams->mNumInks = 0; 
24.     pageChanged = false; 
25.     PDDocColorConvertPage( pdDoc , colorParams , 0 , NULL , NULL , 0 , NULL , &pageChanged ); 

2:

1. AVDoc avDoc = AVAppGetActiveDoc();
2. PDDoc pdDoc = AVDocGetPDDoc(avDoc);
3. int pageCount = PDDocGetNumPages(pdDoc);
4. for(int i=0;i<pageCount;i++)
5. {
6.     PDPage page = PDDocAcquirePage(pdDoc, i);
7.     PDEContent pdeContent = PDPageAcquirePDEContent(page, gExtensionID);
8.     ASInt32 elementCount = PDEContentGetNumElems(pdeContent);
9.     for(int j=0;j<elementCount;j++)
10.     {
11.         PDEElement e = PDEContentGetElem(pdeContent, j);
12.         ASInt32 t = PDEObjectGetType(e);
13.         if(t == kPDEImage)
14.         {
15.             PDEImage pdeImage = (PDEImage)element;
16.             PDEColorSpace space = PDEImageGetColorSpace(pdeImage);
17.             ASAtom spaceName = PDEColorSpaceGetName(space);
18.             if(std::string(ASSAtomGetString(spaceName)) == "DeviceCMYK")
19.             {
20.                 PDEColorSpace cmyk = PDEColorSpaceCreateFromName(ASAtomFromString("DeviceCMYK"));
21.                 PDEImageSetColorSpace(pdeImage, cmyk);
22.             }
23.         }
24.     }
25.     PDPageSetPDEContent(page, gExtensionID);
26.     PDPageNotifyContentsDidChange(page);
27.     PDPageReleasePDEContent(page, gExtensionID);
28.     PDPageRelease(page)
29. }

[lrosenth · Accepted solution]

The second method is a definitely fail – that won’t do any color conversion. There is an API for color converting a single PDEElement, though can’t recall it offhand.

On #1

- the BIG issue is that you aren’t setting a value for the mSize member in the ActionRec

- The second issue is that you aren’t clearing the memory and/or setting all unused fields to 0. Memory is a funny thing ☺.

- Finally, not sure why you are using -1’s instead of the proper kColorConvObj_AnyObject, etc. Use the constants, they are there for a reason

[chongl43868165]

I didn't find mSize member in the PDColorConvertActionRec

I've changed like this, but still not:

1. AVDoc avDoc = AVAppGetActiveDoc();
2. PDDoc pdDoc = AVDocGetPDDoc(avDoc);
4. ASBool pageChanged = false;
5. PDColorConvertParamsRec colorParams = {0};
6. PDColorConvertActionRec colorConvertAction = {0};
7. AC_Profile  workingProfile; 
8. ACGetWorkingSpaceProfile(kACWorkingCMYK, &workingProfile);
10. colorConvertAction.mMatchAttributesAny = kColorConvObj_AnyObject;
11. colorConvertAction.mMatchSpaceTypeAny = kColorConvAnySpace;
12. colorConvertAction.mMatchIntent= AC_UseProfileIntent;
13. colorConvertAction.mConvertIntent = AC_UseProfileIntent;
14. colorConvertAction.mConvertProfile= workingProfile;
15. colorConvertAction.mEmbed = true;
16. colorConvertAction.mPreserveBlack = true;
17. colorConvertAction.mUseBlackPointCompensation= true;
18. colorConvertAction.mAction = kColorConvConvert;
19. colorConvertAction.mIsProcessColor = false;
21. colorParams.mActions = &colorConvertAction;
22. colorParams.mNumActions = 1;
23. colorParams.mInks = NULL;
24. colorParams.mNumInks = 0;
26. PDDocColorConvertPage( pdDoc , &colorParams , 0 , NULL , NULL , 0 , NULL , &pageChanged ); 

[lrosenth]

Ah, I see now.

I am looking at the Ex versions of these structures and APIs…