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In addition to what dj_paige said (the image aspect ratio must match A4 for even margins)…
Which A4 paper size is selected in the macOS Page Setup dialog box?
The size you pick determines:
- The available print area
- Whether the print will be scaled
If we know what the selected paper size is, that might provide a clue for what’s happening.
(My screen shot is for an older Epson photo inkjet that’s similar to the P900)
Also, in the Format For menu, make sure that the P900 is selected. If it’s set to Any Printer, you’ll get a generic list of paper sizes that might not match the capabilities of the P900.
And despite my request to print in 20X27cm, I always have 20.5cm more or less.
That's 21.0x29.7
If you don't crop this photo to exactly the aspect ratio 210x297 (or 21.0x29.7) before you print on A4 paper, you can get strange things like 20.5cm. Are you cropping to this aspect ratio? (I can't see your screen captures, I can't see anyone's screen captures, you need to include screen captures by clicking on the "Insert Photos" icon)
I just tried again, I cropped my image to 20x29.7 but it still comes out at 20.5x29.7
I just tried again, I cropped my image to 20x29.7 ...By @etienned48537726
These are not the right numbers to use when cropping. They don't match the numbers I stated twice.
[edit: on reflection, the below is not I think the OP's issue - but I'll leave in place just for general info.]
It is not always necessary to change the main crop of the image (in Develop) to match exact image Print dimensions - though it would be, to match exact Export dimensions. You can achieve the former entirely inside the Print module..
In Print, each goes inside a containing cell. Dimensions of this cell are controllable directly. If this cell is any smaller than the physical page, then white margins must be left for that reason.
These dimensions define a printed aspect ratio: which may or may not match the current Develop crop of this image. The way the image sits inside this Print cell is controlled by two checkboxes:
The orange option sets (in English) Zoom to Fit (when unchecked) / Zoom to Fill (when checked).
FIT means: scale the image so that nothing is lost - which means further white margins must show to the extent that there is a difference between the shape of the cropped image and the shape of the containing cell.
FILL (checked) - means: scale the image as needed such that no white margins show inside the cell (though white margins may still show outside the cell). And, dynamically trim off - just for the output, not affecting the image itself - whatever picture edges are needed to achieve this. The image can be moved around to achieve the composition you want, if you don't want a centred automatic trim.
This dynamic cropping is no different in its effect, than if you had changed the main crop in the exact same way - just, it is much more convenient not to have to do this.
Furthermore, the same image can this way be printed to a variety of shapes, even on the same page and at the same time. As shown in the above screenshots: these only differed from each other, in their "Fill" checkbox setting.
The 3 prints always come out the same in 20.5X29.7 :-/ I wonder if it's not a problem with the settings of my ESPON P900 printer...?By @etienned48537726
Following up with richardplondon’s idea…
…in an earlier post you showed that in macOS Page Setup, the paper size selected for the P900 is A4 Sans Bordure (A4 borderless). richardplondon said that would enlarge the print slightly, and I agree; maybe that is why they are 20.5cm instead of 20?. Were these last prints also at the paper size A4 Sans Bordure, or just A4?
Because I think we would expect A4 to print at the exact size of the print cell, but minus the minimum margins of the P900. The user manual for the P900 says its minimum margins are 3mm.
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