Gery some minor pointa might be related if you can take a read here... is dpi same as pixels per inch (ppi). a fact using Photoshop or printing is to use 200 or 300 ppi (the density or spatial resolution). screens are fine with 100 ppi an iPhone4 creates a photo with 72 ppi. but to print this would be a small photo on a printer.
how big an image prints depends on resolution or ppi of the image. not sure how xml is transposed into a print image but sounds similar to printing an image... maybe this is a bug but all depends on printing with a higher ppi vs viewing on screen with a lower ppi - which is as expected based on density of pixels. Sent on iPhone ( check spell Off, Auto Correction Off ) Tom Dineen On Feb 7, 2011, at 8:24 PM, Gerry Beggs <gbeg...@mts.net> wrote: > Thanks Raleigh. > I discovered a work-around. But there does appear to be a bug. > > This was difficult for me to test because I wasn't able to reproduce it (from > a new document) on my machine. But I received a document created by a user on > their machine which I was able to use to reproduce the problem. This problem > must depend on the printer driver being used. > The document file contains the PMPageFormat data saved as XML representation > using PMPageFormatCreateDataRepresentation(...) > > > On my machine (and most users' machines) the print resolution saved in the > XML is set to 72 dpi. > But in the sample document I received, the print resolution was set to 2400 > dpi. > > When drawing the page content, the CGContext transform was set correctly when > rendering the print preview, but when rendering the actual printed page, the > CGContext's transform scale was changed to 3% (= 72/2400) (If I tried to > change the scaling back to 100%, the clipping rectangle still limited me to > drawing in the small rectangle in the corner) > > > Long story short, I fixed the problem by calling the deprecated function > PMSetResolution on the PMPageFormat to set it to 72 dpi before printing. > I use a preprocessor condition preventing this line from compiling as 64-bit. > > > If there's a good explanation of why this happened, I'd like to know. > But the fact that the print preview didn't render the same as the actual > printout tells me that it might be a bug. > > > On 2011-02-07, at 11:11 AM, Raleigh Ledet wrote: > >> Gerry, >> >> File a radar. Include the file or a sample project or whatever you can to >> help us duplicate. If this is a Cocoa bug, then you should be able to >> duplicate with a small sample app pretty quickly. >> >> -raleigh >> >> On Jan 18, 2011, at 5:42 PM, Gerry Beggs wrote: >> >>> Just to follow-up (and clarify) my own problem: >>> >>> I have implemented NSDocument's printOperationWithSettings: method to kick >>> off the printing process when the user selects Print from the File menu. >>> >>> I am using the same NSView drawRect: method to display on-screen as when >>> printing. >>> The Print Preview in the Print Dialog always appears correct. >>> However, the final print output is appearing scaled down, either when >>> printing to paper, or to PDF. >>> >>> When the problem presents itself, the transformation of the CGContext is >>> the same when drawing the print preview as when drawing the actual output. >>> That is, it is scaled down, which explains why the output is small. >>> When the problem doesn't present itself, the transformation is the identity >>> transformation when drawing the actual output. >>> >>> >>> I've discovered that if I run my application as a 64-bit executable, the >>> problem goes away. >>> When running under 32-bit, the problem is consistent. >>> >>> Thanks for any help. >>> >>> On 2011-01-16, at 1:24 AM, Gerry Beggs wrote: >>> >>>> I've been having a problem with my application sometimes (but not always) >>>> printing the full page, but it appears VERY small in the lower-left corner >>>> of the page. >>>> >>>> I was having trouble reproducing it, but finally received a sample >>>> document from one of my users that let me reproduce it. >>>> Still, sometimes it prints correctly filling the page, other times, it >>>> prints scaled down in the lower-left corner of the page. >>>> >>>> I am using NSPrintOperation from an NSDocument to handle the printing >>>> operations. >>>> >>>> When trying to debug this issue, I examined the transformation from my >>>> view's drawRect method using CGContextGetCTM. >>>> I discovered something interesting: >>>> - When the printout appears scaled down, the transformation structure is >>>> the same as it is when the print preview image is rendered. >>>> - When the printout appears full-sized, the transformation structure is >>>> the identity matrix (ie. scale = 100%) >>>> >>>> >>>> Since the scale of the CGContext is the same when rendering the print >>>> preview as it is when rendering the full-sized page, this explains why my >>>> printouts are appearing very small in my output. >>>> >>>> Values 'a' and 'd' in the CGAffineTransformation structure indicate the >>>> scaling factor and for the print preview, it makes sense that it is scaled >>>> down for the print preview. But somehow, the transformation is not being >>>> set back to 100% scaling for the actual printing. >>>> >>>> I've looked for unbalanced CGContextSaveGState/CGContextRestoreGState >>>> calls, but they are all balanced. >>>> >>>> I've spent too much time trying to debug this. If anyone can give any >>>> ideas why my printouts are appearing scaled down, I would appreciate any >>>> help. >>>> Thanks. >>>> >>>> -- >>>> gbeg...@gmail.com http://www.GerrysCuppaTea.org/ >>>> >>>> _______________________________________________ >>>> >>>> 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: >>>> http://lists.apple.com/mailman/options/cocoa-dev/gbeggs1%40mts.net >>>> >>>> This email sent to gbeg...@mts.net >>>> >>> >>> -- >>> gbeg...@gmail.com http://www.GerrysCuppaTea.org/ >>> >>> _______________________________________________ >>> >>> 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: >>> http://lists.apple.com/mailman/options/cocoa-dev/ledet%40apple.com >>> >>> This email sent to le...@apple.com >> >> > > -- > gbeg...@gmail.com http://www.GerrysCuppaTea.org/ > > _______________________________________________ > > 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: > http://lists.apple.com/mailman/options/cocoa-dev/dineen5214%40gmail.com > > This email sent to dineen5...@gmail.com _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. 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