What is d.p.i.?

[whippet]

I am having problems with a company who are putting a picture on to canvas for me.

To avoid quality deviations, please use an image file with the resolution of 150dpi-300dpi and pay attention to the preview in the ordering process. The product is then printed exactly as shown in the preview.



I thank you for your cooperation in this case.

I haven't a clue where to find dpi.
Or could you please translate this for me.

[michelb]

dpi is used in inkject printing (dots per inch) to indicate the maximal resolution the printer is able to achieve.

They should speak of ppi (pixels per inch) which is the only interesting and pertinent value to use in digital imaging. That's what is indicated as 'resolution' in your screenshot.

[pontiac1940]

I do not understand why that company is questioning the resolution. PSE does not have dpi (dots per inch). They only use ppi or pixels per inch. Technically there is a difference between dpi and ppi but for practical purposes they can be interchanged freely.
www.adorama.com/alc/pixels-and-printing-size-matters/

All of the dozens (hundreds) of prints I've made (many large high-end prints and canvases hanging in our house) have been sized using ppi. I used either 240 or 300 ppi for print files and usually use 240 for larger canvases. 
 
I don't understand why they might be questioning this. Perhaps it is a standard "warning" posted by the print company. I've seen similar when ordering here. They are covering themselves as people will submit low resolution photos and complain when the prints are poor quality.
Good luck, 
Clive

[Tpgettys]

Hi whippet ,

You already have been given good information here.  As Clive said, when they say dpi you can substitute ppi.

Your screen shot shows an image that is 5760x1920 pixels, but you didn't say what size print you want.  If you are asking the company to create a print that is 24x8 inches the dpi (ppi) will be 240, well above their minimum of 150 dpi.  It could be as big as 38.4x12.8 inches and still be at their minimum of 150 dpi.

[whippet]

Thank you all for your valuable help.
Yes, Tom, the size I ordered is 24x8 inches.
I shall get straight back to the company.

[whippet]

They have got back to me, again, and told me to re send the photo - as is.

Thank you again.
At least I have learned something here. 

[Tpgettys]

That’s good to hear. I’m sure it will be beautiful.