Error Troubleshooting

Warning message - Canvas2D: Multiple readback operations using getImageData are faster with the willReadFrequently attribute set to true.

Symptom

When you are using Chrome 107(developer version) & 106 (official version) or any version above these, you could encounter a warning in console:

Canvas2D: Multiple readback operations using getImageData are faster with the willReadFrequently attribute set to true. See: https://html.spec.whatwg.org/multipage/canvas.html#concept-canvas-will-read-frequently

Cause

Based on Google developer guide, the setting for attribute willReadFrequently in getContext("2d") has to be true if you are using Chrome 107(developer version) & 106 (official version) or higher, otherwise it will show this warning message.

Solution

Step 1. Navigate to ‘../Resources/dynamsoft.webtwain.initiate.js’ replace all getContext("2d") to getContext("2d",{willReadFrequently:true})

Step 2. Navigate to ‘../Resources/src/dynamsoft.viewer.js’ replace all getContext("2d") to getContext("2d",{willReadFrequently:true})

Planning

It will be fixed in version 18.0 officially.