The greater the number of passes, the longer the trace operation takes, the greater the resultant file size, but the final result is closer to the original bitmap.

With each pass the tracer attempts to more closely match any shading in the original bitmap. Obviously this increases the memory required for the final object. You may require an object with minimum shading and just broad areas of color. Use one pass for such bitmaps.

If you require the shading to be represented accurately, use multiple passes. the greater the number of passes, the longer the trace operation takes, the greater the resultant file size, but the final result is closer to the original bitmap.

With each pass the tracer attempts to more closely match any shading in the original bitmap. Obviously this increases the memory required for the final object. You may require an object with minimum shading and just broad areas of color. Use one pass for such bitmaps.

If you require the shading to be represented accurately, use multiple passes.

Bitmap Tracer