Images Of Different Aspect Ratios

I have images from various vendors which of which are differently proportioned than my standard size images from my won photography. Will CS-Cart simply resize them proportionally to fit? I don't want them to brake layouts or appear all distorted because of improper scaling. Where are any settings to control this and insure images will display correctly? Thanks for any insights.

Settings->Thumbnails

[quote name='The Tool' timestamp='1414031086' post='194941']

Settings->Thumbnails

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Thanks.