PhotoLab has automated the horizontal levelling of the image with the magic wand. The function is quite good at recognizing vertical lines.
The action of the magic wand is usually relevant. If not, ignore the two tool handles offered when opening.
For a efficient procedure:
– Place the first point and hold the Left click
– Slide to the second point then release
– “PREVIEW” button to apply the correction
– ENTER key to apply and exit
Temporarily turn off Auto Crop in order to be aware of deleted content.
A request for verticality correction will be understood as such by PhotoLab.
– Draw a line representing the expected vertical
Be careful not to destroy the perspective effect with too rigorous an adjustment. Preferably consider vertical lines which are always vertical in our visual environment.
The correction can be done with great precision.
– Menu: View – Grid (Ctrl / Cmd + G)
– Click on the slider of the palette then turn the mouse wheel. The step is 1 ° for each action
– Refine in steps of 0.01 ° with the up / down arrows to the right of the slider
Note the two 90 ° left or right rotation menus.
– Menu: Image – Rotation (Ctrl + L or R / Cmd + L or R)
It lacks the functionality of pivoting along the vertical axis (flip or mirror). This very common practice in a dark room laboratory fully participates in the photographic composition.
This can be obtained with third-party software, see the chapter “Launch an External Editor”.
The correction of the horizon leaves black triangles in the bounded box following the diagonal of the initial photo. Automatic cropping can make a significant part of the composition disappear.
A workaround is to counteract image rotation with perspective correction (ViewPoint plug-in).
– Activate Crop with the option “Auto based on keystoning / horizon”
– Twist the image with the four-line perspective tool until all the black triangles have
This alternative is suitable for images without geometric reference points (constructions, …) as long as the deformation remains acceptable.
When making larger geometric corrections to the horizon or perspective, some essential elements of the composition on the edge should be retained. The initial photo has become a trapezoid inscribed in the rectangle of the developed image.
The Repair function’s clone tool is unable to paint in areas outside of the raw photo frame.
The solution is to leave the black triangles in the frame and then export the image as is. They are now part of this version with larger dimensions than the original. Fill in the missing pixels using the “Clone” tool of the Repair function.
– Disable Auto Crop> manual correction
– Crop possibly leaving black areas
– Export the image in TIFF or DNG (*) without resizing it
– Open this image
– Use the preset “5- No correction” so as not to apply the optical corrections a second time
– Complete the dark areas with the “Clone” tool
(*) Export the image in TIFF format if the image processing is finished. This version will be frozen and will only be used for cloning.
Export the image in DNG format to keep all the development latitude after completing the black pixels completion. This solution is more interesting because it allows all the latitude of correction.
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