Let Photoshop to do the calculations. In the dialog box image Size in Photoshop, there is a button that many users ignore. It’s called Auto and here is how it works; You indicate the desired image quality (Draft, Good, or Best) and Photoshop will make the calculations for the proper resolution of the image based on your selections.

So, here is what Photoshop does: if you want a 133 lines screen and select high (Best) quality, Photoshop doubles the number of tracks and provides an analysis of 266 ppi. In moderate (Good) quality, multiply the number of lines roughly with 1.5 (Draft) quality and it gives you 72 ppi. When using this feature, keep in mind to start with high-resolution images, 300 dpi or greater for the best result. If you start with a 72 dpi image and ask 133 lines with high quality, Photoshop will set analysis 266 ppi - but the image will appear and separate the pixels, so don’t be surprised as this is not added into the analysis initially, the final result will basically be trashable.

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