By default, Slack optimizes the images that you upload and send to other users in your workspace. Although optimization lowers the resolution of the image, it is sent faster, which is better if your internet service is poor. However, you may want to send the highest resolution possible, so how do you prevent Slack from sending only optimized lower quality photos?
In the Slack settings on your Android or iPhone you can disable the function that transmits optimized images so that you get the highest possible resolution. The higher the resolution, the more detailed the image is, what is needed if the image will be printed on a banner, appear prominently on a website, or any other scenario in which it will be displayed larger than normal.
Disable image optimization
First open the Slack app and start a conversation. Tap the menu with three dots in the upper right corner and then tap the "Settings" option at the bottom of the menu that appears.
Now go to "Advanced" and turn off the switch next to "Optimize images for upload". Every image you send now is sent with the highest possible resolution.
To take a look at the difference between optimized and full resolution images sent via Slack. Below you see the same image, in Slack, sent once with the setting Optimize image uploads enabled (left) and off (right). As you can see, the optimized image is 2.41 MB, while the non-optimized image is 3.09 MB.
It takes longer to send the image via Slack, but it is worth the extra few seconds of waiting if you have a need high resolution. Unfortunately, this does not work for images that you receive. The sender must also Optimize image uploads disabled so that you can receive high-res photos from them.
This article was produced during Gadget Hacks special news about the use of your smartphone to increase productivity. View the entire Productivity series.
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