Unlike other software, Cropping and Horizon are two separate functions of PhotoLab. The independent application of each of its corrections allows to improve the accurarcy.
– Draw a frame along the diagonal by holding the Left click
– Press ENTER to exit the tool

Click to enlarge – Alt+ < to return

Description of the 4 states according to the illustration

Image ratio

1- By default this function keeps the proportions, the initial ratio, of the photo
Choose from the list a different ratio OR
– Enter any value, numeric or ratio eg: “1.333” or “6.5 / 4” (respect spaces) OR
– option “Unconstrained”

Note the 7/5 ratio corresponds to the ISO A format (A4,…).
Personal ratio values ​​are  retained from one session to the next.

The choice of DxO to respect the ratio of the camera does not suit some photographers. It can easily be changed in the personal startup preset.


PhotoLab reports live the pixel dimensions of the cropped image. It is not possible to enter values.
The metadata window displays the cropped size of the photo. PhotoLab only resizes the image when exporting. It is at this moment that the output dimensions must be indicated.




Unconstrained mode

2- A combination of keys allows you to quickly switch to an unconstrained frame, there is no need to select the “unconstrained” option
– While holding down the CONTROL / SHIFT key
– Pull on one of the corners of the dotted frame OR
– Pull on a handle of the edges to limit the direction
– Release the press on the key

Unconstrained mode becomes permanent for this image.

When carrying out new operations on the frame of this image, it is no longer necessary to press the key.
– Hold down the SHIFT key (Windows and Mac) to modify the frame while preserving these new proportions

By default PhotoLab overlays a 3:2 grid for cropping according to the rule of thirds.


On wide-angle photos, PhotoLab recovers much more lateral information than other software and direct JPEGs (especially for photos taken with cameras applying digital corrections). The starting frame of the cropping function sometimes cuts off those gained pixels which can be valuable.
– Switch to “Unconstrained” mode to preview the gain
– Disable the “Keep aspect ratio” option, Distortion function of the “Geometry” palette, to recover the maximum area of ​​the image corrected for distortion


Landscape and Portrait orientations

3- To swap the Landscape and Portrait orientations
– Selecting a vertex then
Cross the frame diagonally by holding the Left Click until you go past the opposite vertex

Note the Left or Right orientation buttons on the image.

The image can be rotated on the fly while cropping
Place the mouse cursor outside the frame, the rotation mode is activated
– Hold the click to rotate the image
The angular value is shown in the Horizon palette.


Restoring the auto constraint

4- After the Horizon or Perspective corrections, restore the option “Auto based on perspective / horizon” to force the frame to occupy the maximum rectangular area


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