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core imageQC and very large images Any suggestions for keeping QC efficient when working with large images? I've got a little side-project (asteroid hunting of all things!) that involves processing a big bunch of large (as in DSLR size) images in 32bit mode. I've worked out the memory requirements for this at around 128mb per image.. ouch. Well, QC seems to handle tiling the images transparently in the background, and with only one image plus a few copies loaded at any one time, it should run a little slow but otherwise OK right? Well, no.. in fact when I ran my composition it ate 6GB of ram. 6GB! I only have 4GB in total, my poor mac was nearly killed :D The composition isn't that heavy though, it should use a couple of GB or so. First question then: how the hell do I keep memory usage to a minimum? One possible issue is that I'm doing feedback rendering. Using CI with feedback is well known for causing a memory leak (I REALLY fear the results of that leak in this case :D) but I've re-worked my feedback using GLSL to get around it. I don't see any leakage with smaller images, and this seems to be stable once it's used a big chunk of memory. Another problem is that the GPU's maximum texture size seems to be 1k x 1k for 32 bit mode (same memory footprint as the normal 4k x 4k in 8 bit mode). Again, QC seems to manage it seamlessly in the background, but I get issues with CI filters around the tile edges if I try to sample outside the current tile... any fix for that? For now, I've created a macro that splits the image into 1024x1024 chunks so I can process them one at a time and recombine at the end. Not ideal, but it should get me running at least.. I'll have to add some overlap to the tiles if I can't figure out the CI issue. It's still going to eat too much memory though, so any advice is much needed :)
GL Tools 1.4 crash in Music Visualizer Please find quoted below the resulting crash report when iTunes ducked my CLGL variation of the Arabesque screensaver as a music visualier. I am going to dive in and take a look at what I've changed to provoke this error, seems to be one of the presets alone, all others run AOK. GLTools got mentioned in dispatches as follows :- Process: iTunes [1936] Path: /Applications/iTunes.app/Contents/MacOS/iTunes Identifier: com.apple.iTunes Version: 9.0.3 (9.0.3) Build Info: iTunes-9031501~5 Code Type: X86 (Native) Parent Process: launchd [134] PlugIn Path: /Users/cybero/Library/Graphics/Quartz Composer Patches/GLTools.plugin/Contents/MacOS/GLTools PlugIn Identifier: net.kineme.GLTools PlugIn Version: 1.4 (20091217.2212r6563) Date/Time: 2010-02-24 12:41:20.288 +0000 OS Version: Mac OS X 10.6.2 (10C540) Report Version: 6 Interval Since Last Report: 321683 sec Crashes Since Last Report: 58 Per-App Interval Since Last Report: 190820 sec Per-App Crashes Since Last Report: 1 Anonymous UUID: 1AA3AE71-8AF0-44AD-8109-9157EDB0AF38 Exception Type: EXC_BAD_INSTRUCTION (SIGILL) Exception Codes: 0x0000000000000001, 0x0000000000000000 Crashed Thread: 0 Dispatch queue: com.apple.main-thread Application Specific Information: objc[1936]: FREED(id): message retain sent to freed object=0x1de4bc30 Thread 0 Crashed: Dispatch queue: com.apple.main-thread 0 libobjc.A.dylib 0x970374b4 _objc_error + 116 1 libobjc.A.dylib 0x970374ea __objc_error + 52 2 libobjc.A.dylib 0x970357dc _freedHandler + 58 3 com.apple.QuartzComposer 0x968d0b48 -[QCStreamExporter_QCArray createRepresentationOfType:withProvider:withCount:elementSize:type:options:] + 1830 4 com.apple.QuartzComposer 0x968d0178 -[QCStreamManager createRepresentationFromProvider:ofType:withCount:elementSize:type:options:] + 1490 5 com.apple.QuartzComposer 0x969c7ce0 -[QCStream(QCStructure) _populateWithStream] + 301 6 com.apple.QuartzComposer 0x969c737e -[QCStream(QCStructure) memberAtIndex:] + 71 7 net.kineme.GLTools 0x1e296ebf 0x1e27c000 + 110271 8 com.apple.QuartzComposer 0x96840575 -[QCRenderingManager renderAtTime:arguments:] + 1674 9 com.apple.QuartzComposer 0x968a5a71 -[QCRenderInImage executeSubpatches:arguments:] + 118 10 com.apple.QuartzComposer 0x968a54cc -[QCRenderInImage execute:time:arguments:] + 2557 11 com.apple.QuartzComposer 0x9683f396 -[QCPatch(Private) _renderAtTime:arguments:] + 111 12 com.apple.QuartzComposer 0x9683f302 -[QCRenderingManager addPatch:context:time:arguments:nextExecutionTime:] + 2200 13 com.apple.QuartzComposer 0x9683e21f -[QCPatch(Private) __execute:arguments:] + 754 14 com.apple.QuartzComposer 0x9683deba -[QCPatch(Private) _execute:arguments:] + 1728 15 com.apple.QuartzComposer 0x9683e991 -[QCPort _execute:arguments:] + 268 16 com.apple.QuartzComposer 0x9683dd6e -[QCPatch(Private) _execute:arguments:] + 1396 17 com.apple.QuartzComposer 0x9683e991 -[QCPort _execute:arguments:] + 268 18 com.apple.QuartzComposer 0x9683dd6e -[QCPatch(Private) _execute:arguments:] + 1396 19 com.apple.QuartzComposer 0x9683e991 -[QCPort _execute:arguments:] + 268 20 com.apple.QuartzComposer 0x9685dc3d -[QCMultiplexerImagePort _execute:arguments:] + 130 21 com.apple.QuartzComposer 0x9683dd6e -[QCPatch(Private) _execute:arguments:] + 1396 22 com.apple.QuartzComposer 0x9683e991 -[QCPort _execute:arguments:] + 268 23 com.apple.QuartzComposer 0x9683dd6e -[QCPatch(Private) _execute:arguments:] + 1396 24 com.apple.QuartzComposer 0x9683e7ac -[QCPatch(Private) _executeSubpatches:arguments:] + 243 25 com.apple.QuartzComposer 0x9683e5e1 -[QCPatch(Customization) nextExecutionTimeForSubpatches:time:arguments:] + 192 26 com.apple.QuartzComposer 0x9683e4e9 -[QCPatch(Customization) nextExecutionTime:time:arguments:] + 81 27 com.apple.QuartzComposer 0x9683e443 -[QCPatch(Private) _nextExecutionTime:arguments:] + 461 28 com.apple.QuartzComposer 0x9683e18f -[QCPatch(Private) __execute:arguments:] + 610 29 com.apple.QuartzComposer 0x9683deba -[QCPatch(Private) _execute:arguments:] + 1728 30 com.apple.QuartzComposer 0x9683e7ac -[QCPatch(Private) _executeSubpatches:arguments:] + 243 31 com.apple.QuartzComposer 0x9683e5e1 -[QCPatch(Customization) nextExecutionTimeForSubpatches:time:arguments:] + 192 32 com.apple.QuartzComposer 0x9683e4e9 -[QCPatch(Customization) nextExecutionTime:time:arguments:] + 81 33 com.apple.QuartzComposer 0x9683e443 -[QCPatch(Private) _nextExecutionTime:arguments:] + 461 34 com.apple.QuartzComposer 0x9683e1d7 -[QCPatch(Private) __execute:arguments:] + 682 35 com.apple.QuartzComposer 0x9683deba -[QCPatch(Private) _execute:arguments:] + 1728 36 com.apple.QuartzComposer 0x9683c4ba -[QCContext nextExecutionTimeForPatch:time:arguments:] + 643 37 com.apple.QuartzComposer 0x9683c231 -[QCGraphicsContext nextExecutionTimeForPatch:time:arguments:] + 73 38 com.apple.QuartzComposer 0x9683c00b -[QCOpenGLContext nextExecutionTimeForPatch:time:arguments:] + 528 39 com.apple.QuartzComposer 0x9683bde8 -[QCPatch(Runtime) nextExecutionTime:arguments:] + 92 40 ...QuartzComposer.iTunesPlugIn 0x188ead89 iTunesPluginMainMachO + 9304 41 ...QuartzComposer.iTunesPlugIn 0x188eb210 iTunesPluginMainMachO + 10463 I will try to reproduce the CLGL related problem in a simpler composition that does not redistribute Apple's own code, as is personally and privately the case on my machine at present. First sigill of this year BTW :-) .
Drop Alpha Channel (Composition by smokris)
Removes the alpha channel from an image (i.e., makes it fully opaque). Image Rehab (Composition by smokris)
Core Image is incredibly powerful, but sometimes produces images with non-obvious properties. Image Rehab attempts to clean up some of these properties.
Low / high pass filters Hello all, For a composition I'm doing, I need something akin to a clamp or high pass filter. What I mean is a patch that'll accept an image and a color input, and then output a pure black / pure white image using the color as a threshold. For my application, this would be used with an image that's already b/w, so it could use e.g. only the red channel. I've tried my hand at a Core Image filter that does this, but I'm utterly bewildered since the documentation is so scant. I keep getting errors about data-dependent conditionals and swizzles. Is it really impossible to return a value from a CI filter based on a conditional statement? Or is there an obvious way of doing this I'm missing? In other software, I'd use a curve adjustment or similar, but I haven't found an equivalent in QC. The color controls is too fidgety and dependent on the input image. Any pointers would be appreciated.
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