A while ago I upgraded from DxO 4 to 7. For a while I have thought the JPEGs in DxO 7 were not as good. I have checked the settings on both versions and identically processed and saved the same file at 300dpi. The DxO4 file size is 17mB, the DxO7 file size is only 2.4mB. As I do wildlife photography I often need to crop photos heavily and I get better results using DxO 4. Am I doing something wrong?
Welcome @StephenFFphotos
DPI resolution has no influence on JPEG file size.
It’s the definition that’s important.
Pascal
1 Like
It seems that the author has problems with this item. Again ppi and dpi are misunderstood.
A test in PL8 exporting an image with 72ppiI and 700ppi shows no difference in size, as expected.
George
Please share a screenshot of your export-to-JPEG settings in PhotoLab 7.
1 Like
You must have mixed up some settings with your export.
Here is the output from PL4 and PL7 export.
note
PL7 CL = Classic Legacy color space (= the same as in PL4)
PL7 WG = Wide Gamut colorspace (= the default color space)
+
PL7 got some slightly different settings, e.g. for sharpening
And when comparing the result in 2 different programs, be sure both have no edits done. Meaning a reset and apply preset “no corrections”. And probably no inclusion of exif and icc profile.
George
Thanks for your help. I have now sorted it out In DxO 7, when I look under File, export to disk, advanced settings. I have the option to change DPI, which was set to 300. There was also a resizing mode option which was set to ‘Longest side’ 2024 pixels. This was set by DxO 7 when it was installed. When I reset this to 6000, the number of pixels on the longest side of my camera sensor, the file size then matched the file size in DxO 4.
When I look at File, Export to disk, advanced settings. in DxO 4, I could see the DPI was set at 300, but I could not see anywhere to check the resizing, which DxO must have automatically set to the resolution of the camera when installed.
In future threads I suggest using the actual name of the software to which you are referring, rather than just DxO 4 or DxO 7. There have been at least four software titles released by DxO over the years in a version 4 and 7. They are Optics Pro, PhotoLab, FilmPack and the Nik Collection.
Mark
PL mentions ppi. It’s a request to the printer to print the image at a resolution of x pixels per inch. A size of 6000 pixels will become 20 inch with a setting of 300ppi.
Dpi is about printing quality and is set in the printer driver. A normal printer has mostly only 2 settings 300dpi and 600dpi, or 360dpi and 720 dpi. Low for text and high for images.
Many times dpi and ppi are used wrong. Even in Wikipedia.
George
2 Likes
PhotoLab would only have set that upon installation by importing the same setting from the previous version installed on your computer. (Did you ever try out PhotoLab 5, 6, or 7 before?). I’ve never seen PhotoLab set this option on its own or do anything else similar.
3 Likes