I have made a number of my own Speed Dial Icons for use with Opera One in Windows.
In Gimp my master file is 900 Pixels Wide x 540 Pixels High at 300 Pixels Per Inch or 118 Pixels Per Cm RGB Colour Space.
I have Guides Left and Right 43 Pixels in from each edge and 80 Pixels from the Top and Bottom.
Within the guides I place anything that is Super Critical text etc.
I export the Icons as flattened PNG files.
I also have used Inkscape to create Icons and and used the 900x540 Dimensions and guides though with Inkscape being Vector you do not specify resolution until exporting the PNG files.
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