I have a Fuji X-T5 camera which I haven't really used, and have almost no workflow for.

Could someone explain what this software does?

And I'd also appreciate any software and workflow people use.

Would prefer Linux software, but macOS is okay if the quality/ ease of use is too different.

Great to see more Fuji X attention, their native software isn't great. Looking forward to trying it out with my older X-T20, which appears supported[1] surprisingly

I was about to mention the Fudge[2] app and its underlying library, but its already listed as a reference, nice!

[1] https://www.fujifilm-x.com/en-us/support/compatibility/softw...

[2] https://github.com/petabyt/fudge

Love this - had contemplated different setups for getting raw studio running on linux but gave up before even trying. This is exactly what I wanted - a way to play with different recipes, no install required.

It bugs out for my XT30 because the profile is a different format, but claude was able to figure out a tweak to get it running and hide some of the features the XT30 is too old for - will do the wireshark thing from a windows machine at some point.

Thank you!

Worked!! Samsung Galaxy fold 7, Chrome 146.0.7680.153, GFX 100S II firmware 1.20

MacOS 15.6.1 - could see the camera via PTP but couldn't connect (clicking "connect" didn't do anything, no error)

While file format (RAF, DNG) often is an acronym, “raw” by itself simply references raw image data; it is not an acronym, not a trademark, and does not need all caps.

The mistake of “shouting” raw is perpetuated in the wild even by serious companies, but let’s not let Apple degrade our literacy[0]. I’ll point to Adobe which does, in fact, use the correct spelling[1].

[0] It is fine when used as part of idiomatic spelling of their product or trademark (“ProRes RAW HQ”, etc.), but IIRC their promotional materials and even developer docs do shout it when simply referencing raw image data, which is a little ridiculous.

[1] https://helpx.adobe.com/camera-raw/digital-negative.html

This is pretty impressive work.

On a related note, Fuji’s simulations being locked to their walled garden has been an issue for third party tools forever. All “replications” of on device are just that. And never comparable.

I think a lot of people would like to study how they work to create true replications.

> FilmKit uses WebUSB to connect directly to your camera, your camera's own image processor handles the conversion. FilmKit is a static client-side app, hosted on Github Pages

This is amazing. Thank you. Seems to be working just fine with X-H2.

The only reliable raw converter that can handle Fuji color is Capture One. But they have collaboration with Fuji, I don't believe that conversion algorithm is open sourced.

But it would be interesting if AI coding agent could potentially reverse engineer the algorithm.

Wanted to edit camera profiles on Linux, couldn't get the official app to run in Wine, so I built my own https://filmkit.eggrice.soy

I also personally find the original app infuriating to use, takes a lot of click & wait to modify a profile.

This is amazing, thank you for launching it. I know this webapp itself will make me more likely to look at raw photos on my Fuji once again.

Interesting, I’ll check it out. But just like X RAW studio, I bet that it won’t work with my old X-E1.

A ChromeOS Platform application, rather.

This is amazing, thank you for launching it. I know this webapp itself will make me more likely to look at raw photos on my Fuji once again.

While file format (RAF, DNG) often is an acronym, “raw” by itself simply references raw image data; it is not an acronym, not a trademark, and does not need all caps.

[1] https://helpx.adobe.com/camera-raw/digital-negative.html

Never thought about that. Always wrote it all uppercase because that’s what camera maker Canon consistently does from what I’ve seen.

If I search for Canon raw on Google the Canon owned websites that I see writes it all uppercase; RAW.

One of their pages that I find even makes note of that:

> The letters RAW do not stand for anything – it's just a convention that RAW is usually written in capital letters – and the names of RAW files from Canon cameras do not end in .RAW.

https://www.canon-europe.com/pro/infobank/image-file-types/

Funny, I've been shooting digitally since 2007 and I've never seen RAW spelled other than RAW. I guess we've been doing it all wrong :shrug:

> FilmKit uses WebUSB to connect directly to your camera, your camera's own image processor handles the conversion. FilmKit is a static client-side app, hosted on Github Pages

Isn't that same as a jpeg then?

Edit: There are some parameters:

> FilmKit communicates PTP (Picture Transfer Protocol) over USB, the same protocol that X RAW STUDIO uses. The camera does all the heavy lifting: it receives the RAF file and conversion parameters, processes them, and returns a JPEG.

The only reliable raw converter that can handle Fuji color is Capture One. But they have collaboration with Fuji, I don't believe that conversion algorithm is open sourced.

But it would be interesting if AI coding agent could potentially reverse engineer the algorithm.

Like the native Fujifilm software, this does not do raw conversion itself. It uses the processor in the camera to do the conversion.

Wanted to edit camera profiles on Linux, couldn't get the official app to run in Wine, so I built my own https://filmkit.eggrice.soy

I also personally find the original app infuriating to use, takes a lot of click & wait to modify a profile.

Funny, I've been shooting digitally since 2007 and I've never seen RAW spelled other than RAW. I guess we've been doing it all wrong :shrug:

This is really cool! I see you’ve got screenshot of it running on Android, could this ever also work on iOS? I tried in iOS on Chrome, but I just see “WebUSB not supported. Use Chrome, Edge, or Brave.”.

Never thought about that. Always wrote it all uppercase because that’s what camera maker Canon consistently does from what I’ve seen.

If I search for Canon raw on Google the Canon owned websites that I see writes it all uppercase; RAW.

One of their pages that I find even makes note of that:

> The letters RAW do not stand for anything – it's just a convention that RAW is usually written in capital letters – and the names of RAW files from Canon cameras do not end in .RAW.

https://www.canon-europe.com/pro/infobank/image-file-types/

I'd expect a cause is that most camera makers are Japanese, and it's not uncommon in Japan to uppercase words written in Latin alphabet for aesthetic reasons

Isn't that same as a jpeg then?

Edit: There are some parameters:

>Isn't that same as a jpeg then?

Yeah, but Fuji X cameras are renown for their JPG processing so many people want the in-camera JPG. You could shoot directly to JPG but with an app like that you can later change the JPG profile, etc. while adjusting exposure parameters.

Like the native Fujifilm software, this does not do raw conversion itself. It uses the processor in the camera to do the conversion.

Smart move of Fujifilm. That will the future of software licencing with AI breaking copyright. Software will come encrypted and only run on secure processors. AI will push us further into an age of cloud, software DRM and software patents. The rest will be effectively public domain.

I'd expect a cause is that most camera makers are Japanese, and it's not uncommon in Japan to uppercase words written in Latin alphabet for aesthetic reasons

Very plausible, I haven’t considered it.

Perhaps the combination of that and the old .raw filename extensions on old filesystem implementations where everything appears uppercase (since camera firmware is slower to catch up, this persisted for years even though contemporary OS already had no such limitation) made it stick.

I have a Fuji X-T5 camera which I haven't really used, and have almost no workflow for.

Could someone explain what this software does?

And I'd also appreciate any software and workflow people use.

Would prefer Linux software, but macOS is okay if the quality/ ease of use is too different.

Great to see more Fuji X attention, their native software isn't great. Looking forward to trying it out with my older X-T20, which appears supported[1] surprisingly

I was about to mention the Fudge[2] app and its underlying library, but its already listed as a reference, nice!

[1] https://www.fujifilm-x.com/en-us/support/compatibility/softw...

[2] https://github.com/petabyt/fudge

This is pretty impressive work.

On a related note, Fuji’s simulations being locked to their walled garden has been an issue for third party tools forever. All “replications” of on device are just that. And never comparable.

I think a lot of people would like to study how they work to create true replications.

Thank you!

Worked!! Samsung Galaxy fold 7, Chrome 146.0.7680.153, GFX 100S II firmware 1.20

MacOS 15.6.1 - could see the camera via PTP but couldn't connect (clicking "connect" didn't do anything, no error)

This is amazing. Thank you. Seems to be working just fine with X-H2.

A ChromeOS Platform application, rather.

Interesting, I’ll check it out. But just like X RAW studio, I bet that it won’t work with my old X-E1.

>Isn't that same as a jpeg then?

Very plausible, I haven’t considered it.

filmkit.eggrice.soy

FilmKit

Browser-based preset manager and RAW converter for Fujifilm X-series cameras for desktop and mobile.

Desktop

Android

This is author's cat. Shoutout to Fuji X Weekly for awesome presets!

Features

Note that the app is in BETA. It's currently tested on X100VI only. It likely works with other X-series cameras that support Fujifilm's RAW conversion protocol (X-T5, X-H2, X-T30, etc.), but this has not been verified. If you have a different camera and want to help, see Supporting New Cameras below.

Just like Fujifilm X RAW STUDIO, FilmKit uses WebUSB to connect directly to your camera, your camera's own image processor handles the conversion. FilmKit is a static client-side app, hosted on Github Pages.

Camera Preset Management - Read, edit and write custom presets on your camera. The iteration should be significantly faster than X RAW STUDIO, thanks to better camera work queue management, non-locking UI and auto-conversion toggle.
Local Preset Library - Save presets in your computer, drag & drop between camera and local storage.
RAW Conversion and Live Preview - Select a RAF file, adjust film simulation parameters, and get back a full-quality JPEG processed by the camera.
Preset Detection - Loading a RAF file automatically detects which preset was used to shoot it (temporary profile created if not present).
Preset import/export - Import or export presets as file, link or text paste.
Quick compare - QUickly compare between original and current preset.
Mobile support - Easily manage presets on-the-go using your phone.
Zero installation and cross-platform (supports Linux).

Requirements

Browser that supports WebUSB, this includes Chromium-based browswer like Google Chrome on desktop and Android.

Appropriate udev rule required if the browser is running in Flatpak, ex:

SUBSYSTEM=="usb", ATTR{idVendor}=="04cb", MODE="0666"

How It Works

FilmKit communicates PTP (Picture Transfer Protocol) over USB, the same protocol that X RAW STUDIO uses. The camera does all the heavy lifting: it receives the RAF file and conversion parameters, processes them, and returns a JPEG.

For preset management, FilmKit reads and writes individual preset properties (D18E–D1A5) using standard PTP GetDevicePropValue / SetDevicePropValue operations.

See QUICK_REFERENCE.md for full protocol documentation.

Reverse Engineering

FilmKit's protocol implementation was built with the following reference materials:

rawji
fudge
libgphoto2
Wireshark USB captures: communication between X100VI and X RAW Studio were captured using Wireshark (on Windows with USB capture) to reverse-engineer preset property encoding, write ordering, and conditional write behavior (ex. HighIsoNR uses a proprietary non-linear encoding, Color Temperature can only be written when WB mode is set to Color Temp, monochrome film simulations reject Color writes).

The camera's native d185 profile format (625 bytes) uses different field indices and encoding from the format in RAF files. FilmKit uses a patch-based approach: copy the base profile byte-for-byte, only overwrite fields the user changed, to preserve EXIF sentinel values.

Supporting New Cameras

FilmKit has only been tested on the X100VI. If you have a different Fuji X-series camera and want to help expand support, you can capture USB traffic with Wireshark:

How to capture

Install Wireshark with USBPcap (or equivalent for macOS)
Open Wireshark and start capturing on the USB bus your camera is connected to (ex. USBPcap1:\\.\USBPcap1)
Open Fujifilm X RAW Studio, and perform one of the following actions you want to capture:
- Profile read: Just connect and let the app read the camera state
- Preset save: Change all preset values and save it to one of the profile slots
- RAW conversion: Load a RAF and convert with one of the presets (local or on-camera)
Stop the capture and save as .pcapng
Repeat from 3 for another action.

Filter Wireshark with usb.transfer_type == 0x02 (bulk transfers) to see only PTP traffic.

What to share

Open an issue on GitHub with:

Your camera model and firmware version
What you captured (please capture all three)
The .pcapng files
The parameter values you used (so we can correlate bytes to settings)

Additional captures may be required with various property values (ex. for ranged-based value, typically preset save or profile read of min/max values are good enough, but we may face another case of HighIsoNR weirdness).

Contributing

This project does not accept any pull requests.

What is welcome:

Bug reports via Issues
Feature requests via Issues
Camera compatibility reports with Wireshark captures (see Supporting New Cameras)

Bug Reports

When filing a bug report, please include:

Your camera model and firmware version
Steps to reproduce the issue
The debug log - scroll down to the Debug section at the bottom of the right sidebar, click Copy Log, and paste it into the issue

Made with ♥ by eggricesoy · @eggricesoy

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