Epson TM-T88V-DT Technical Reference Manual page 110

3
Specify the image data file for logo.
The file must be smaller than W: 2047  H: 831 pixels (dots) in bmp, jpeg, gif, or png
format.
If the logo width exceeds the paper width (80 mm printing: 512 dots, 58 mm printing: 360
dots), an error message appears. Click [OK], and go to Step 4 to reduce the size in the
[Logo Edit] screen.
4
On the [Logo Edit] screen, click [Monochrome] or [Multi-tone] to select
the image format to output.
[Monochrome] reduces the colors to black and white. [Multi-tone] reduces the
colors to 16 colors (graduation) in grayscale.
When the Mode for Storing Logo is set to "Key-code Nonuse Mode (not recommended),"
[Multi-tone] does not appear.
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