National Radio
Astronomy Observatory

5.2.4 Parameter imsize

The image size in numbers of pixels on the x and y axes is set by imsize. For example,

makes a square image 640 pixels on a side. If a single value is given, then a square image of that dimension is made. The underlying algorithms work best for certain image sizes. If you pick a size where that algorithm will be particularly slow, the logger will send a warning message, suggesting the nearest optimal values. In general, the best performance is obtained with image sizes that are even and factorizable to 2,3,5,7 only. An easy rule of thumb would be 2ⁿ × 10 where n is an integer number, like 160, 320, 640, 1280, 2560, etc.

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