Thank you Glenn. You are right. > Furthermore, if the image is a jpg image, clipping would need the image to be > recompressed and end up degrading the image quality (since PDFs can embed jpg > files directly), or again, potentially increase the file size. Yes, I thought about that. And I have indeed seen that small but real degradation. Not so fine. At the end I left the world as is.
> And if you draw a PDF image inside the view, those PDF instructions/objects > are encoded into the resulting file - if you want to clip that, you either > need to rasterize it (loosing quality) or perform clipping operations on > shapes to produce new ones (which can be non-trivial). I though to not to clip the vectorial images, but as I wrote above... At this time, I am struggling with the QuartzFilter to compress the pdf :-) I'm going to post a new question since it sounds as a different topic. Regards -- Leonardo > Da: glenn andreas <gandr...@me.com> > Data: Thu, 27 Feb 2014 10:20:58 -0600 > A: Leonardo <mac.iphone....@gmail.com> > Cc: Cocoa-dev List List <cocoa-dev@lists.apple.com> > Oggetto: Re: dataWithPDFInsideRect doesn't clip images within NSView > > A PDF file can "reuse" an image and draw the same thing multiple times in > multiple places. If it saved just the clipped version, it would need multiple > copies of the same image, which would actually increase the file size. > > So if the purpose of adding a "cropImages" flags was to save file space, in > some case it will result in taking more space. > > Furthermore, if the image is a jpg image, clipping would need the image to be > recompressed and end up degrading the image quality (since PDFs can embed jpg > files directly), or again, potentially increase the file size. > > And if you draw a PDF image inside the view, those PDF instructions/objects > are encoded into the resulting file - if you want to clip that, you either > need to rasterize it (loosing quality) or perform clipping operations on > shapes to produce new ones (which can be non-trivial). > > > On Feb 27, 2014, at 9:57 AM, Leonardo <mac.iphone....@gmail.com> wrote: > >> Thank you. I have coded it. I lock the focus of the NSView, I draw and get >> the clipped image, then I re-draw the NSView with the clipped image + >> borders, rotation, shadow. Of course, since the user could choose the ppi >> output, I resize-resample the view before locking it. >> >> It should be useful to have an option as >> [view dataWithPDFInsideRect:bounds clipPaths:YES]; >> >> >> >> Regards >> -- Leonardo >> >> >>> Da: Graham Cox <graham....@bigpond.com> >>> Data: Thu, 27 Feb 2014 22:38:42 +1100 >>> A: Leonardo <mac.iphone....@gmail.com> >>> Cc: Cocoa-dev List List <cocoa-dev@lists.apple.com> >>> Oggetto: Re: dataWithPDFInsideRect doesn't clip images within NSView >>> >>> >>> On 27 Feb 2014, at 9:31 pm, Leonardo <mac.iphone....@gmail.com> wrote: >>> >>>> I draw an NSImage within an NSView scaling its size in order to fill the >>>> image within the view bounds. The image is larger than the NSView's bounds, >>>> but on the display it looks well clipped to those bounds. >>>> >>>> Since the image's NSView is a subView of the page's NSView, I create a PDF >>>> saving that page's NSView >>>> >>>> [pageView dataWithPDFInsideRect:pageRect]; >>>> >>>> and I get a pdf file. Anyway, when I inspect the pdf file with Acrobat, I >>>> clearly see that the image hasn't been cropped. As I see from the blue >>>> rectangle around the visible small image, the whole original and larger >>>> image has been embedded within the pdf document. >>>> In facts if I Control-Click-Edit the image on the pdf, I get the original >>>> whole image. So the pdf file size results bigger than what it would really >>>> be. I don't get this trouble when saving the page to a TIFF or any other >>>> raster image file (with NSBitmapImageRep -> CGImage -> >>>> displayRectIgnoringOpacity -> CGImageDestinationFinalize). >>> >>> >>> This is exactly what you'd expect. Core Graphics basically *is* a PDF. So >>> when >>> you draw an image into a view that is clipped, all you're doing is setting a >>> clipping path and drawing an image. The PDF faithfully records that. >>> >>> When you create a different image that is clipped to the smaller area, then >>> that's what is recorded. >>> >>>> My question: >>>> Do you know an option, any API, to clip the image to its NSView's frame on >>>> the pdf, as it properly looks on the display? Or should I clip the image by >>>> my own code? >>> >>> >>> When you know how it works, the question becomes moot. The short answer is >>> 'no', there's no API. You have to resample/crop the image as you need, or >>> accept the larger filesize for the convenience that you get from the simple >>> API. >>> >>> --Graham >>> >>> >> >> >> _______________________________________________ >> >> Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) >> >> Please do not post admin requests or moderator comments to the list. >> Contact the moderators at cocoa-dev-admins(at)lists.apple.com >> >> Help/Unsubscribe/Update your Subscription: >> https://lists.apple.com/mailman/options/cocoa-dev/gandreas%40me.com >> >> This email sent to gandr...@me.com > _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
