Steps to reproduce:

1. Create a new project
2. Add renderpipeline core package
3. Remove ImageConversion package (and all its dependencies)

Actual results: 

These compilation errors are shown:

{code:java}
Library\PackageCache\com.unity.render-pipelines.core@f26052b82791\Runtime\PathTracing\LightmapIntegrationHelpers.cs(329,35): error CS0246: The type or namespace name 'ImageConversion' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\com.unity.render-pipelines.core@f26052b82791\Runtime\PathTracing\SphericalHarmonicsUtil.cs(118,20): error CS0103: The name 'ImageConversion' does not exist in the current context {code}
Expected results: 

No errors or warnings are shown

Reproducible with versions: 6000.4.0a1

Not reproducible with versions: unknown

Can’t test with versions: 

Tested on (OS): Windows

Notes: