![]() Traits=GetPixelChannelMapTraits(image,channel) Let's do that again but take full advantage of the new variable pixel channel support:įor (i=0 i < (ssize_t) GetPixelChannels(image) i++)Ĭhannel=GetPixelChannelMapChannel(image,i) SetPixelAlpha(image,QuantumRange-GetPixelAlpha(image,q),q) If ((GetPixelAlphaTraits(image) & UpdatePixelTrait) != 0) ![]() SetPixelBlack(image,QuantumRange-GetPixelBlack(image,q),q) If ((GetPixelBlackTraits(image) & UpdatePixelTrait) != 0) SetPixelBlue(image,QuantumRange-GetPixelBlue(image,q),q) If ((GetPixelBlueTraits(image) & UpdatePixelTrait) != 0) SetPixelGreen(image,QuantumRange-GetPixelGreen(image,q),q) If ((GetPixelGreenTraits(image) & UpdatePixelTrait) != 0) SetPixelRed(image,QuantumRange-GetPixelRed(image,q),q) If ((GetPixelRedTraits(image) & UpdatePixelTrait) != 0) Let's naively refactor the version 6 code snippet from above so it works with the ImageMagick version 7 API: Source code that compiles against prior versions of ImageMagick requires refactoring to work with ImageMagick version 7. ImageMagick version 7 supports any number of channels from 1 to 32 (and beyond) and simplifies access with a single method that returns an array of pixel channels of type Quantum. If (SyncCacheViewAuthenticPixels(image_view,exception) = MagickFalse) Indexes=(IndexPacket) QuantumRange-indexes Q->green=(Quantum) QuantumRange-q->green Indexes=GetCacheViewAuthenticIndexQueue(image_view) Q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception) As an example, here is a code snippet from ImageMagick version 6 that negates the color components (but not the alpha component) of the image pixels: The black channel or colormap indexes are supported by a separate method and structure, IndexPacket. The structure includes 4 members of type Quantum (typically 16-bits) of red, green, blue, and opacity. The first 4 channels are accessed with the PixelPacket data structure. Prior versions of ImageMagick (4-6), support 4 to 5 pixel channels (RGBA or CMYKA). Pixel ChannelsĪ pixel is comprised of one or more color values, or channels (e.g. During the Beta cycle, version 6 developers can attempt to port their software to version 7.ĭuring the ImageMagick version 7 development cycle and release, we will continue to support and enhance version 6 for a minimum of 10 years. An official ImageMagick version 7 release depends on how smoothly the Beta cycle progresses. Look for a Beta release sometime in late 2012. We intend to make ImageMagick version 7 available as an Alpha release by the mid-year 2012. Options, and more global use of 'image properities' (more commonly known as With shell API overhaul other improvements are being made, including:īetter reporting of which option failed, the consolidation and depreciation of Image handling using 'deamon/server backends', and even multi-machine ThisĪllows for the use of 'co-processing' programming techniques or performing Only from the command line, but also from scripts, and file streams. The shell API (command line) of ImageMagick version 7 is also undergoingĪ major overhaul, with specific emphasis on the ability to read 'options' not Magick++ and PerlMagick should behave exactly as it does for ImageMagick version 6. There are some modest changes to the MagickWand API. You can access channels as an array, pixel, or use an accessor such as GetPixelRed() or SetPixelRed(). To support variable pixel channels in the MagickCore API, pixel handling has changed when getting or setting the pixel channels. Other design changes are in the works and we will document them here so be sure to revisit periodically. ![]() With ImageMagick version 7, we extend support to arbitrary colorspaces with an arbitrary number of pixel channels. Over time we extended support to RGBA images and then to the CMYK and CMYKA image format. ImageMagick was originally designed to display RGB images to an X Windows server. With ImageMagick version 7 we aim to improve the design based on lessons learned from the version 6 implementation. The design of ImageMagick is an evolutionary process, with the design and implementation efforts serving to influence and guide further progress in the other.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |