It appears as if nearest neighbour filtering is used to scale images inside of Image Controls with Scale..."Keep Ratio". This is visually unappealing. Given that higher quality scaling algorithms are available elsewhere in LO (such as those used by Writer and Impress for resizing pictures) it should be possible to apply them here. To reproduce: create an Image Control inside of a form. Populate the control with an image that is either larger/smaller than the control itself. Ones with line art/text work best. Observe the scaling is different to if the same image is inserted into a writer document and scaled to an equivalent size.
Could you attach any example documents to allow others to check on different system/build?
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