DXO - 32 bits x 16 bits

DxO PhotoLab
1

Maybe what I’m going to write here won’t be new to everyone, but for me it seemed like something new that I didn’t know about at DxO PhotoLab
I uploaded photos from my Iphone 13, in tiff and tried to open them in DxO 7. I received error messages that the files were either corrupt or not compatible with files for DxO. In Photoshop they opened without any problem but I noticed that they are 32-bit files. I decided to transform them and save them in 16 bits. I went back to DxO and they opened beautifully. I didn’t know about this limitation of not opening 32-bit files and so I’m passing on this information that may be useful for those who didn’t know, like me.

2

I’m guessing that, since most RAW files only record 14 bits and most cameras record 16 bit TIFF files, that is to be expected for an app that is primarily focused on cameras. Whereas apps like Photoshop are for bit manipulation, so more understandable. I’m not sure why Apple think 32 bits are necessary for a phone camera

3

This is from PhoroLab’s user guide. Note that PhotoLab only supports 8 and 16-bit TIFF files.

Files opened by DxO PhotoLab

DxO PhotoLab handles the following file formats:

  • RAW files from cameras supported by the program.
  • Native DNG files from supported cameras.
  • Linear DNG files created by DxO PhotoLab.
  • DNG files created by Adobe Lightroom, Camera Raw and DNG Converter, excluding compressed lossy DNG format. DNG files output by merge HDR, Panorama, or Panorama HDR from Lightroom or Camera Raw.
  • 8 and 16-bit TIFF files.
  • JPEG files.
  • JPEG and PNG files for watermark graphics, imported using the Watermark palette.

Mark

4

Obrigado Joana.
Eu também não entendo 32 bits para uma camera de telefone. Talvez uma compensação para outras perdas? Não sei. Meus conhecimentos não são tão largos assim.

5

Obrigado mwsilvers.
Fico envergonhado em saber que essa limitação existe no guia do usuário.
Fui levado pela velha e preguiçosa mania de não ler a documentação como deveria. Ela existe para ser lida.
Apendendo a cada dia que devo ser mais cuidadoso sobre minhas dúvidas.
Obrigado pelo sutil “puxão de orelha”, como falamos no Brasil quando algúem cometeu um erro bobo.

6

There is nothing for you to be ashamed about. I think that most PhotoLab users don’t spend a lot of time going through the user’s guide.

Mark

1 Like
7

32 bits is 4x8. Probably 8 bit per channel and another byte for other info.
16 bit is 16 bit per channel, 48 bit per pixel.

George

8

It seems that the iPhone is using 32 bits per channel but switched to 64 bit. It stops supporting 32 bit. Still don’t know if this is per channel or per pixel. How big are these files?

George

9

Nothing too big. Less than 10 Mb.

10

So probably 8 bits and an alpha channel as it is called.
You must distinguish between the amount of bits for memory access and bit depth. Memory access is now a days 64 bit.
For photo’s bit dept is 8 or 16. That can also be expressed as 24 or 48.
Raw files are disk files. Access is different.

George

11

Os arquivos foram exportados em tiff como eram originariamente no meu Iphone 13

12

უკაცრავად, მე არ მესმის პორტუგალიური.

I don’t have iPhone, but in iPhone 13 specs I found that it can produce only JPEG and HEIF files. So, any TIFF file was produced by another piece of software (RawPRO ?). You may have to configure it to export 16-bit TIFF files. By this I mean TIFF files where the full resolution image has the tag BitsPerSample set to 16. Exporting with BitsPerSample=32 doesn’t make any sense, as this sensor capability is much, much below 16-bits per sample, even with good light. Please use exiftool (see https://exiftool.org/ – basic tool to get photo file metadata) to provide the output of the following command, to get any further help:
exiftool -s -a -ee -G -m -e

13

Beside that, what can be the dimensions of a 10Mb tiff file?

George