Remove white border around GraphicsRow, GraphicsGrid, GraphicsColumn?

Question

When displaying images with GraphicsRow, GraphicsColumn, and GraphicsGrid, a thin white border is added to the image. This makes it difficult to pad the image.

An example:

Is there a way to remove the border? Setting ImageMargins or ImagePadding to 0 does not work.

Code to reproduce the issue:

GraphicsRow[Table[Graphics@Disk[], 3], Background -> Blue] // 
 ImagePad[#, 50, Blue] &

Here is a trick: GraphicsRow[Table[Graphics@Disk[], 3], Background -> Blue] // ImageCrop // ImagePad[#, 50, Blue] &. — J.W Kang, Jan 18 '21 at 14:30
GraphicsRow[Table[Graphics@Disk[], 3], Background -> Blue, PlotRangePadding -> None] // ImagePad[#, 50, Blue] & — Bob Hanlon, Jan 18 '21 at 15:01
@BobHanlon Thank you! What's the best practice when your question is answered in the comments? — mikabozu, Jan 18 '21 at 15:06
I suggest that you answer your own question while acknowledging the help of others. — Bob Hanlon, Jan 18 '21 at 15:11

score 1 · Accepted Answer · answered Jan 19 '21 at 01:20

The solution, provided by Bob Hanlon in the comments, is to set PlotRangePadding -> None. From the documentation:

"By default, 2% of padding is added to the plot range in each direction"

GraphicsRow[Table[Graphics@Disk[], 3], Background -> Blue, 
  PlotRangePadding -> None] // ImagePad[#, 50, Blue] &

Another option, mentioned by J.W Kang in the comments is to use ImageCrop. This function will "remove borders of uniform color," ridding us of the pesky white border.

Remove white border around GraphicsRow, GraphicsGrid, GraphicsColumn?

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