getCustomImageURL - maximum height

The Effervescence theme uses the following to control the image size:
(getCustomImageURL(550, null)

How can I change it, to only control the height?
I want for example the maximum height to be 600. I don’t care much about the weight!

How can it be done?
I tried the following without success:
(getCustomImageURL(600, 800)
(getCustomImageURL(800, 600)

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