Photoshop won't print actual size

[ivanod]

Hi guys, i made a simple layout which needed to have certain measurement. 

i used guides in my file to get the exact dimensions (even put the actual ppi of my monitor) but when i go to print directly from photoshop it says that the file is too big and it will be scaled down.

is it just my printer that have a strange print size for A4 or do i need to change something?

[Kevin Stohlmeyer]

You answered your own question - you set this up with your monitor ppi not the printer.

Set it to 300 ppi or your desired printer settings.

[ivanod]

 the ppi for printing are already set to 300

[Nancy OShea]

Go to Image > Image Size.  What values are shown for height, width and resolution?

It could be that the image falls outside your printer's prinatable area. 

A4 paper size in inches = 8.27" x  11.69"

A4 paper in cm = 21 x 29.7

[ivanod]

Width:209,97mm
Height:297,01mm

Res:300ppi

Dimensions:2480x3508px

A4 would be 210x297 tho, i've picked it from the start up page for a new document. Maybe i just need to unlink the two and change to the exact value

[Nancy OShea]

Does your printer support borderless printing?  If not you'll need to factor in your printer's margins, too.

[Conrad_C]

…you'll need to factor in your printer's margins, too.

By @Nancy OShea

That is probably the correct answer…the margins.

Photoshop is comparing the document size to the printable area of the paper, not the total paper size. The printable area is paper size minus the printer’s margins; the alert appears if the resulting dimensions are smaller than the document size (plus any marks or bleed, if selected).

The document size and A4 are both 210mm by 297mm, but if you subtract the margins shown by the diagonal lines around the edge of the print preview, then the printable area is smaller than the A4 document size. That is what Photoshop is noticing.

This is not necessarily a problem. If the document doesn’t have any content in the margin areas, then nothing will be cut off, so just continue to print.

However, if the document content goes all the way to the edge, that content will not print in the margin area, so then the choices are to fit the document to the printable area (scaling it down a little), or enable borderless printing if available (although that might scale up the document a little).

Printer margins are not controlled by Photoshop; margins can differ depending on the printer model. Photoshop uses margin values that were provided to it by the printer’s driver software.