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In some cases, I agree with the manager.
Programmatically I tested one image using python(library: opencv).
First, I calculated the original image's average value of all RGB pixel values.
Second, I resized it 2 times bigger and shrink it to the original size.(I used cv2.INTER_AREA flag. There are many methods to shrink an image.)
I can inspect slightly ...
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I've run into this. I don't know why it happens, but here's my workaround.
I put all my layers in a folder.
Duplicate the Folder
Turn off the original folder.
Merge the layers of the Duplicated folder.
Now when you export, photoshop is resizing off of your merged layers and it seems to work fine vs. getting darker.
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To code! I think you will have greater flexibility if you utilize html/CSS and then use images only when necessary.
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I would strongly advise against using such services. To make a layout that will work with all browsers and mobile devices takes a lot of testing and readjustment. $45 is not going to give you what you want nor will $200. I mean most Adobe products let you Export your files to HTML but they don't keep any development issues in mind.
My recommendation would ...
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