IO modality images not showing in correct grayscale in web viewer

Josef · August 22, 2025 at 11:59 AM

When we open IO (Modality) images in the web viewer, some of the bright parts of the image are shown as black. It's not an inversion of the image. I've attached both images for reference.

marcelvanherk · August 22, 2025 at 6:37 PM

Hi,

this looks like integer overflow. Can you send the image and all details - version, what viewer etc. Can't solve it without.

Marcel

Josef · August 25, 2025 at 7:58 AM

I've attached the dicom file as a zip.
We are using the web server included with Conquest DICOM to view the image. Conquest DICOM is the latest version 1.5.0e.

marcelvanherk · August 25, 2025 at 4:09 PM

Hi,

I think this was already fixed on Github on 16th Feb this year. Can you update dgate64.exe from there and see if it is fixed?

Marcel

Josef · August 26, 2025 at 6:32 AM

Hi Marcel,

Thank you for pointing me in the right direction. I couldn’t find a standalone dgate64.exe on GitHub, so I downloaded the entire master branch. After running ConquestDICOMServer.exe in it and doing the initial configuration, I was able to locate the dgate64.exe in the same folder.

I copied that dgate64.exe into my test installation of Conquest DICOM, and now the images display correctly in the web viewer.

Just to confirm—was this the correct way to get the updated dgate64.exe?

Thanks again for your help,

Joseph

marcelvanherk · August 26, 2025 at 9:47 AM

Hi,

great that it is fixed. I think you can just browse the source files on GitHub and download it from folder install64. But your way works too!

Marcel

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