ImageManipulation results in artefacts

[HeyImPhil]

Module version(s) affected

3.1.2

Description

Artefacts appear on the manipulated image when using methods like ScaleWidth on certain mesh style images.

How to reproduce

1. Upload a mesh style image like the one attached
2. Using an image manipulation like ScaleWidth

$Image
$Image.ScaleWidth(322)
$Image.ScaleWidth(282)

This will result in the following output

Original Image:

Possible Solution

No response

Additional Context

No response

Validations

• Check that there isn't already an issue that reports the same bug
• Double check that your reproduction steps work in a fresh installation of silverstripe/installer (with any code examples you've provided)

[michalkleiner]

I don't think this would be an issue with the assets module. The module uses https://github.com/intervention/image as a dependency for image processing, which in turn can use ImageMagick or GD libraries to process the images.

One thing I would try is increasing the quality using Quality method and see if it helps.