Ndinogona here kuchengeta kuratidzwa kwechifananidzo, kana kumanikidza zvakajeka zviyero?
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Both. Lock the ratio and one dimension is derived from the other, which is what you want almost always. Unlock it and you get exactly the numbers you typed, at the cost of stretching — useful for a fixed slot, wrong for a photograph.
I Kuchinja upamhi BMP ichadzikisa mhando ye BMP images yangu?
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Hapana. A lossless source round-trips bit-exactly, saka kana iwe uchida kubvunza zvakajeka kune lossy output format the pixels that come back are the pixels that went in. That is the whole reason to keep working in this family while you are still editing.