Hello jbrembat,
Can you please explain your comment about 300 DPI being an urban legend?
Thank you
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Ok.
When you see a print, you
see DPI (Dot Per Inch), not PPI (Pixel Per Inch).
Depending on printing technology DPI value can be equal to PPI value or larger than PPI value.
DPI=PPI for contone printers (1 pixel= 1 dot).
DPI>>PPI for inkjet printers (1 pixel -> many dots).
Every printer driver works at
fixed PPI and fixed DPI values.
To understand driver think it is a black box.
The input to this box is PPI, the output is DPI.
The driver scan the image pixels and for each one do the job.
The scan (raster operation) is performed picking up a number of pixels equal to the PPI value to lay down one inch of print.
The only way to change the PPI/DPI value is to set the quality of printing. Or, if you can print borderless, the PPI value is slightly changed too
So as you have a weak control of PPI/DPI,
between prefixed values, you
CANNOT print at any resolution tou like.
The printer output resolutions are fixed by the producer.
The only thing you can do is to give the right PPI value to the driver.
If you don't, the driver wil resample your image (Nearest Neighbour is the standard fast way).
Now, every discussion about what resolution the human visual system can discern doesn't make any sense. The printer producer
fixed the DPI value (you can know it as it is in the printer specifications).
Moreover you can find that, after justifying 300 or 240 DPI, by eyes resolution power, people transform the DPI value into PPI value.
BIG MISTAKE.
For inkjet printers PPI value is different from DPI value. Do you know dithering or halftonig or error diffusion?
If you have a printer connected to Windows (or can run a windows application), go to [a href=\"http://www.photoresampling.com/index_eng.php]PhotoResampling[/url], download PrinterData and you will be able to know your printer PPI and printable area.
Jacopo
