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cables DocumentationHow To UseWorking with filesKeyboard ShortcutsUser Interface WalkthroughBeginner TutorialBeginner 1: Drawing A CircleBeginner 2: TransformationsBeginner 3: ColorMore TransformationsIntermediateImage CompositionsPost-Processing 3D ScenesCommunicationcables APIExporting and EmbeddingHow to serve files externally and fix CORS headersExporting PatchesExport using the cables command line interfaceExport via IframeExport creating a standalone executableExport to github (pages)Export and deploy to netlifyExport a ZIP fileExternal triggers / functionsUsing variablesPreviewing / uploading exported cables patchesExamples for EmbeddingCoding OpsCreating AttachmentsGeneral op/Port CallbacksPortsDynamic PortsArray PortsBoolean portsInteger Number PortsObject PortsString portsTrigger PortsFloating Point Number PortsGUI/UI attributesHello Op - Part 1LibrariesDeveloping OpsCreating Viz OpsGuidelinesObject PortsWriting ShadersWeb Audio Op DevelopmentHTML and CSS in cablesLightingLightsShadowsWorking with audioBasic Audio SetupWorking with EffectsReal-Time Audio Analyzation & Audio VisualizationOffline Audio Visualization & AnalyzationOptimizing Performance in PatchesTools for debugging your patchHow to optimize cables patches with the Performance opHow to optimize cables patches with the ProfilerCommon pitfalls with the "usual suspects"Optimizing arraysDebugging Shaders with ShaderInfoFAQAudio in web browsersHow to make demoscene demos with cables.glEmbeddingHow to integrate my cables patch into my CMS (webflow/wix/squarespace/...)?getting a warning when running the patch in electronHow to remove grey rectangles on touch (mobile)?Why doesn't the DownloadTexture op work on iOS?How to disable page scrolling on mobile?Mobile tippsHow to run exported patches on your local machineTransparent CanvasFeatures and SupportHow to contribute code to cablesWill there be support for (animated) GIFs?Screenshots and Video recordingHow to report a bug in cableshow can I support cables?Video playback in cablesGeneral questionsWhat is dev.cables.glJavascript Frameworkscordova / phonegapelectronreactvuejsLicenses and paymentWhat license do i need to use cables?Will I have to pay for it in the future?How is my work licensed when using cables?Does cables support midi and OSC?Patch PermissionsMy User Profile & Social MediaShadertoyCables at schools and universitiesTechnical questionsWebGL1 and WebGL2
cables Documentation  ⟩  Intermediate  ⟩  Image Compositions

Image Compositions

In this example we compose a new image / texture out of one image and some 2d effects.

Basic Setup

  • Image compose creates a new texture, the children ops of Image Compose apply 2D effects onto the texture
  • DrawImage applies an image
  • This example does not change the image at all, it is just a basic setup

Apply An Effect

  • To blur the image we add Blur to the end of the image composition chain
  • The image is now blurred, you can change the Blur parameters, or animate them

Add an Alpha Mask

  • DrawImage has a a slot called imageAlpha
  • Create a new texture op and connect it to the imageAlpha port of the drawImage op.
  • Select it and now click file in the main panel. Browse through the library until you find an image like this.

  • Using the AlphaSrc setting in the drawImage op you can select what defines the alpha / opacity value, in this case it's luminance of our alpha image.
  • If nothing happens try changing the AlphaSrc setting to alpha channel.
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