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300dpi Camera?

Started Mar 8, 2005 | Discussions thread
imbsysop Veteran Member • Posts: 4,963
Re: BTW, do not confuse DPI with PPI...

Medic Laviña wrote:

DPI is equivalent to PPI only when printing in B&W. But when
printing in color, DPI should be 4x the PPI density if every pixel
is to be resolved. This is because a color printer basically mixes
4 dots of different ink colors (including black) per pixel.

sorry but that is absolutely NOT correct ..

PPI and DPI have nothing! to do with each other ...

ad nauseam .. PPI is an arbitrary pixel density set by the user to define the maximum printsize he/she will get on the paper .. (example 3072x2304 aka 7Mpx picture at 300PPI -> 3072/300=10.24 inch largest length for printing, same for other dimension, notice it has nothing to do with DPI! on the printer!)

DPI is just the dot density that the printer is able to produce .. modern printer have 2400, 4800 or even beyond that DPI .. (LPI printers is another story ..)

The 4x factor you are giving is not very relevant because a) several printers mix more than 3colors+black and it all depends on the pixel matrix the printer is using to print (3x3 or 4x4 etc ..)

there are lot of articles on the internet dealing with the correct & extended technicalities of this ...

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