Pixelation of Email Images in Looker Studio

Hello,

We are looking to use Looker Studio to present images of emails. For these images, we typically set the width to 400, with the height auto-adjusting.

However, while the images appear clear initially, they become pixelated once uploaded to Looker Studio. Could you provide any guidance or suggest a recommended width/height setting to avoid this issue?

Looking forward to your insights.

Best regards,
Swizel