Can not upgrade to 4.0

The error indicates a conflict between the Image Effects module (version 4.0.0) and the Color Backport module (drupal/color, version 1.0.3). This happens because the two modules have incompatible dependencies or explicitly declare conflicts.

Steps to Resolve
1. Identify Compatible Versions
Check the release notes and documentation for both modules to identify compatible versions.
Visit the module pages:
Image Effects module
Color Backport module
Determine if downgrading or upgrading either module resolves the conflict.
2. Resolve the Conflict with Composer

Option 1: Use an Alternative Version If there is a known compatible version of the Color Backport module that works with Image Effects 4.0.0, specify it in your composer.json:

composer require drupal/color:1.0.2

Then, retry installing Image Effects:

composer require drupal/image_effects:^4.0

Option 2: Temporarily Remove the Conflicting Module If the Color Backport module is not critical, uninstall and remove it before updating Image Effects:

drush pmu color
composer remove drupal/color
composer require drupal/image_effects:^4.0

After updating, check if you can reinstall a compatible version of Color Backport.

Try

composer require "drupal/image_effects":"^4.0" "drupal/color":"^2.0" -W

That was helpfull!!!! this was the way to go!! Thanks!!!

You're welcome.
Check also my comment in this comment 🐛 TypeError in using Textoverlay Active if you don't want the issue that I had with the Textoverlay function. The comment is from yesterday and should still be implemented.