EPSON 3880 PRINTER DRIVERS DRIVER
If you set your native resolution in your image file to be the same as the printer resolution, the printer driver does not have to do any interpolation, hence the recommendation of using file resolution of 300 ppi for images to be printed on Canon and HP printers and 360 ppi for Epson printers all makes sense.Thanks for the explanation, Manfred, which does indeed highlight the peculiar world of photography where "dpi" means at least two different things but, fortunately, "everybody knows" which is which!
So, the mapping between the pixels in the file and dots on the paper do line up one colour pixel in the image maps to 8 discrete ink dots on the paper. I'm going to simplify a bit and I'm not going to be pendantic and with refer to black as a colour, even though it's not. There is a difference, but the image pixels map to the printer pixels quite nicely. If you set your native resolution in your image file to be the same as the printer resolution, the printer driver does not have to do any interpolation, hence the recommendation of using file resolution of 300 ppi for images to be printed on Canon and HP printers and 360 ppi for Epson printers all makes sense. Canon and HP printers run at 2400 dpi, so 2400/8 = 300 dpi resolution. In the highest quality mode, the printer deposits 2880 dpi using the 8 "colours", so 2880/8 = 360 dpi, which is the "native resolution" of the Epson printers.
EPSON 3880 PRINTER DRIVERS FULL
The 3880 can also deposit two different dot sizes a full sized dot and a half sized dot, so the printer can generate additional colours by varying the dot size. Just to confuse things a bit, there are two blacks one (Photo Black) is used for glossy paper and the other (Matte Black) is used for matte papers, but only one of these is used for a print and the printer selects which one based on paper type in use). It has 8 different ink colours (black, gray (Epson calls this Light Black), light gray (Epson calls this Light Light Black), light magenta, magenta, yellow, light cyan and cyan).
EPSON 3880 PRINTER DRIVERS PRO
Let me stick with the Epson Stylus Pro 3880, that I know quite well. I'm going to simplify a bit and I'm not going to be pendantic and will refer to black as a colour, even though it's not.
But the file itself won't get a property as dpi. And if you want you can resize the image. In your editor you can calculate what dimension your image will get when viewed at a certain resolution. If we do not apply the native resolution at the time of scaling the image, interpolation will occur both in the PP image resizing operation as well as when the image data flows over to the printer and the printer driver is used.The file has a dimension of x by y pixels. If we stick to the native resolution of the printer when scaling, the interpolation of upsampling or downsampling will occur only once, int the PP software.
When we print, we have to set the image size as well as the scaling factor when resizing the image. The Photoshop and Lightroom setup screens both require the dpi to be entered. HP and Canon printers have a native resolution of 300 dpi and Epson printers have a native resolution of 360 dpi. The dpi is a scaling factor and it has to be considered in when sizing the image for printing. Actually George, this is not correct when it comes to printing.
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