Editing on high resolution image taking huge time to generate output image

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I have been working on a photo editor app for iOS using cifilter framework and GPU image framework, it takes a lot of time when applying filters on high-resolution images.

In order to decrease the processing time, I implemented the filtering as well as editing feature by reducing the original size of them. Thus, as obvious, it produces a low-resolution image as an output.

Now I am struggling to generate high-resolution image in the output. Therefore, it would be a great help for me if anyone helps me by providing ideas or probable solutions to decrease the processing time or a way to upscale image resolution to the original resolution.

imagefilter gpuimage cifilter swift ios
1 Answers

In our apps, we use different resolutions for editing and exporting. For editing, the rendering needs to be fast and snappy, but for export, depending on the user-chosen export resolution, processing might take some time.

We reduce the export time for older devices by processing on a smaller resolution internally (but still much higher than preview resolution) and upsampling the image afterward.

For upsampling, you can use a joint bilinear upsampling technique, which uses the original image to scale up the smaller, filtered image with very high quality. Apple implemented this technique in the CIEdgePreserveUpsampleFilter.

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