Add a custom preview image
This section describes how to add a custom preview image to your visualization extension. The preview image is displayed in the preview window which is accessed by selecting the visualization extension from the library.
Do the following:
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Create a new image and save it as a PNG file. It should be saved in the same folder as your other extension files.
Note: The recommended size for a custom preview image is 140 x 140 pixels.
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Update the QEXT file by adding the preview property as shown below. This example uses the Qlik Sense logo as an image.
{"name" : "Extension Tutorial - Hello World","description" : "Extension Tutorial, Simple Hello World.","icon" : "extension","preview" : "qlik-sense-logo.png","type" : "visualization","version": "0.1","author": "Your Name"}
You have now added a custom preview image.