The last step in the development process is to export the images. PhotoLab offers three export formats: JPEG, TIFF and DNG.



Click to enlarge – Alt+ < to return

– Left Click on one or set of images > “Export to Disk” OR
– Export option list, above right the Image browser
– “Add a new option” button, rename it and activate it (we often forget)
– Quality (JPEG compression index) = 95%



Output parameters

An interesting option of PL is to give a destination folder and a suffix to the exported images.
– Destination – Custom folder – path = \3_TVHD or  .\3_TVHD or  ..\3_TVHD

A “3_TVHD” folder will be automatically created at the first export from the current folder.
The path meets unix standards .\ and ..\ (see Table 1). 

Table 1 – Click to enlarge – Alt+ < to return

– Advanced settings – Suffix = _DxO
The suffix is optional but applied permanently It is possible to easily vary the suffix at each export, but we can not to rename it on the fly.

Resize the image

PhotoLab offers six resizing options.


* Fit is the classic option that all software offers. Its name does not specify it, but depending on its original orientation, Horizontal or Vertical, the output rectangle is rotated by 90° to exploit the largest possible size of the container (the output image).

– Horizontal image is output in 1440 x 1080
– Vertical image is output in 1080 x 1440

The order of the boxes 1920 < x > 1080 is indifferent.

* Rotate to fit, is not understood by the PhotoLab testing community.
According to DxO, this option allows you to rotate the original image to best match the orientation of the output … what the “Adjusted” option already does.

* Longest side or Shortest side.
– The Horizontal or Vertical image comes out respecting the instruction 
The dimension of the other side has no constraint

* Megapixel. This is the size of the image in pixels, not the file size 😉

* Proportional. 100% is equivalent to the “Full JPEG” profile option

It is not possible to impose an output file size on PhotoLab.

Resizing in centimeters or inches is the only one that requires that you enter the resolution (in Dots Per Inch or Dots Per Cm).


Table 2 – Click to enlarge – Alt+ < to return


It is possible to export several formats into a command (Elite edition). 
– Validate multiple check marks  

Downsizing is more effective at reducing file size and qualitatively better than high compression for broadcast images. 


There are three methods of interpolation when changing formats.
DxO advises to export to small images with the bicubic option.



Illustrated explanations here
https://www.cambridgeincolour.com/tutorials/image-resize-for-web.htm

ICC Profil

– Choose a ICC color profile: sRVB, Adobe RVB and others
Windows: C:\Windows\System32\spool\drivers\color
Mac OS: /Users/~/Library/ColorSync/Profiles/Recommended folder 

Prophoto ICC profiles are available from these sites :
https://sites.google.com/site/chromasoft/icmprofiles
   (this page also offers a few Prophoto variants)
http://www.color.org/chardata/rgb/rommrgb.xalter
   (don’t mind the ROMM RGB name, it’s Prophoto)
Take a look on this DxO forum page
https://feedback.dxo.com/t/tiff-export-in-prophoto/5285

During installation, PL evaluates the computer performance(*):
* Determines the number of photos to be processed simultaneously when exporting
A inappropriate number of parallel processes, depending on available memory, degrades performance because the system is forced to swap
* Recommends to use the graphics card processor if it is significantly more powerful than the core (Windows)
* The output unit performances (read / write speed, buffer) are essentials

– The Edit / Application – Preferences – Performance menu provides access to these choices

(*) Delete the results file to restart the test.
Windows: C:\ Users \ <user>\  DxO \ DxO PhotoLab <version> \ ocl64.cache
Mac OS: / Users / ~ / Library / Caches / com.dxo.PhotoLab <version> /


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