Adding an image to a survey can add useful context or instruction to your form. However, photos extracted directly from a modern camera are high resolution and will increase the file size and load time of your survey. Here are a few simple tips to optimize your images in Survey123 forms.
Image Size and Quality
Today's smartphone cameras take high-quality photos at resolutions sufficient for printing. Our screens, meanwhile, is a relatively low resolution.
When optimizing images for surveys, first consider the resolution of the devices that will use the form. The Survey123 app automatically resizes photos to fit the screen width, but a massive photo may slow the form down.
In this example, suppose your users will be using iPads with Retina screens and various other smaller screens. The iPad Air 2 has a resolution of 2048 x 1536 pixels. Considering landscape and portrait orientations the maximum image width is 2048 pixels.
Optimizing with IrfanView
The popular, free image viewer IrfanView includes a useful tool to optimize images for the web. Follow these instructions to optimize images with Irfanview.
The optimization uses a plug-in called RIOT. IrfanView will explain how to install it if it is missing.
Use JPEG for photos. Use PNG for screen images or documents.
Displaying the Image in a Survey123 form
Now that you have saved the optimized image, you can add it to your survey.
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