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Add a choice in the field of the image type proceeding expansion.

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For example:
It is necessary for you that all photos in galleries of "participants" would be in jpeg. But different types are allowed for loading, and all of them will be cut off in compliance with the type.
 
I suggest to choose expansion in which the reduced copies of the image will be converted, it can be both control for a field, and expansion for API Image
 
$image->ext() //jpg
$newImage = $image->ext('png')
$newImage->ext() //canonical png convert

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Conversion of image type is more complex than just changing the extension. All the data in the image has to be uncompressed then re-compressed with the new format, and that's something that goes beyond the scope of our image manipulation functions at present. While true that some browsers will recognize a jpg as a jpg regardless of extension (by detecting the type in the image data), the file becomes essentially corrupt as it's no longer consistent with the indicated type.

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