Calculation for Exporting JPG from InDesign at the correct Pixel Size
Exporting JPG from InDesign as anything other than 72dpi will change the pixel size from the size of the document.
Example: Document size 1000x1000px will export at 92dpi at 1333x1333px.
It's really frustraiting when you need to export at specific resolution for printing or web, so I ran some tests and found the calcuations to adjust document size so it will export at the correct size for your intented resolution.
To use this calulation, in document setup:
Type your intended export pixel size and multiply it with the decimal from the chart below. Set the unit as Pixels or type px after the number.
[intented export pixel size] * [decimal from the chart below]
Example: 1200px*.75 =900 document pixel width (exports at 1200px at 96dpi)
| Export Resolution | Multiply Indended Export Pixel Size By: |
| 72 dpi | 0.00 |
| 96 dpi | 0.75 |
| 150 dpi | 0.48 |
| 300 dpi | 0.24 |
| 600 dpi | 0.12 |
| 1200 dpi | 0.06 |
I think it will work well enough for output dpi 300 and under, but over 600 you have to use such a small artboard I'm not sure that would be workable.
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