Fixing black backgrounds in transparent images

Fixed automatically since July 2023

Opensense deployed an automatic fix for this issue in July 2023. If you still have this issue, contact help@opensense.com.

Problem

The image is a PNG with a transparent background (you can check this by opening it in a photo editing program), but it shows up with a black background in emails, and when sent as an attachment.

Examples

A headshot:

Icons:

Solution

Open the image in a photo editing program, such as Photoshop or GIMP, and check whether the precision (or channel) is set to 8 bits. If it is, change it to 16 bits, and save the image again.

GIMP

Go to Image > Precision, and change from 8-bit to 16-bit.

8 bits · Image > Precision > 8 bit integer

16 bits · Image > Precision > 16 bit integer

Photoshop

Go to Image > Mode, and change from 8 bits to 16 bits.

8 bits · Image > Mode > 8 Bits/Channel

16 bits · Image > Mode > 16 Bits/Channel

What’s next

• Optimizing logos for dark mode email signatures
• Troubleshooting signature images

For further help, contact Opensense Support at help@opensense.com.