You can see the diference in the results in the images I used in a 
StackOverflow posting. (Before I remembers this email list.)

https://stackoverflow.com/questions/69107975/how-to-improve-text-contrast-in-pdfbox-rendered-thumbnail-image

On Wed Sep 08 12:40:14 PDT 2021 [email protected] said:
>On Wed Sep 08 12:20:59 PDT 2021 [email protected] said:
>>Am 08.09.2021 um 21:16 schrieb John Lussmyer:
>>> Ok, just tried that - no change.
>>>
>>> We are currently trying PDFBox 3.0.0-RC1 - is that a problem?
>>
>>No, this is excellent; there will be a new release of another beta in a
>>few days. You can try it here
>>
>>https://dist.apache.org/repos/dist/dev/pdfbox/3.0.0-alpha2/
>>
>>Is the PDFBox code creating the same image size as the old code? What
>>code are you using? Can you share a file and the result (upload to
>>sharehoster)?
>
>Image size is within a couple pixels in.  Same format (ARGB).  The the older 
>renderer image file is about twice as many bytes of image file.
>Can't really share the original as it has some names and account numbers.
>The main feature of the PDF is that it is pure text, no images.  8.5 x 11.
>
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