Posts

With hard drives this pricey, every little helps

For unprecedented high dynamic range and a colour space better suited to wide gamuts

Differences in speed and accuracy when applying 3D LUTs using colour-science, Pillow, OpenColorIO, and PyTorch.

Testing and notes on the Gainmap reading and application parts of HDR Conversion version 0.1.5

Why does it look better on the camera screen? Measuring the quality of Hasselblad's built-in display and discussing its use as a stylisation tool.

The similarity check rate is a bit high.

Some interesting details about lossy compression of DNG files using JXL in Adobe DNG Converter.

Two approaches to achieving basic wide colour gamut management on Windows.

The technical details and implementation of DXO PureRAW 6's high-fidelity compressed DNG files.

Tools page for ICDT 2026

Talk is Cheap, Show me Your Prompt.

Switching standard colour spaces over to new colour matching functions by constructing bridge spectra

A simple, universal method based on ICC file structure features, without relying on specific image formats

Analysing HDR images in iPhone photos in HEIC format to understand their structure, decoding, and conversion process.

Baseline Headroom in ISO 21496-1: A Bug and Some Curious Findings

Fly me to the moon. Let me play among the stars. Let me see what spring is like on Jupiter and Mars.

How the added cyan LED affects gamut coverage and its potential impact on human circadian rhythm

Understanding 10/12/14-bit image packing algorithms and solving Numpy slice alignment and padding issues

A seemingly redundant parameter: The role and correct writing method of Alternate HDR Headroom in the ISO 21496-1 standard

Use LibRAW to break down RAW components, then manually piece together a usable DNG file with PiDNG.

Maybe it's just a selling point mentioned at a launch event, but surely no one takes it seriously?

ImageCodecs now supports colour space and transfer function parameters.

Visual Matching Experiment and Tone Mapping based on CAM16-UCS

A bold attempt at a super-high-spec product from a mysterious little workshop, only to suspect I've bought a monitor that has passed through eighteen hands.

Notes in installation of WSL2 for Codex, unknown issue about Hyper-V

Breaking down an innovative tone mapping algorithm and exploring how it balances luminance compression with detail preservation.

A guide to my Zotero setup, focusing on 'simplicity' and 'efficiency' with plugins

A mathematical proof: what does the reflectance of a 'perfect pigment' look like?

Say goodbye to messy proprietary formats — ISO 21496-1 brings a unified specification for Gainmap HDR images

Finished the UltraHDR article yesterday, only to have the X2D II release today and use it.

A backwards-compatible HDR image scheme based on dual-layer JPEG and Gainmap, now widely adopted

A deep dive into the structure of JPEG and the modifications made to support new features

Sharing tips for collaborating with general-purpose LLMs in this field, and tests.

Achieving HDR while ensuring excellent backward compatibility by packaging SDR and HDR images within a single file.

Details in colour adaptation models similar to CAT16: one forward and one reverse, achieving reversibility and transference

Using a badge to roughly show visitor count, and my general process for updating blog posts

A small, practical method for testing the internal screen of Sony cameras and a hands-on example.

To be honest, I do this so often myself that I had to write something as a reminder (and for my own future reference).

Notes for Principles of Colour Reproduction in Digital Images, Ep. 7

Some tedious definitions, with love from BT.2408

Python Implementation of Image Colour Appearance Model (iCAM06)

Conversion of HDR still image formats

Reflections on learning to analyse image colour using Imatest and colour charts

Running fast doesn't guarantee a win; avoiding pitfalls is true success.

Potentially a more effective improvement than class-leading screen brightness and aggressive tuning algorithms.

Decrypting the RAW Colour Cipherbook: CCM Parameter Alchemy and Constructing the sRGB Portal Methodology

Converting RAW to XYZ

Building a matrix to implement conversions between XYZ and RGB spaces defined on XYZ.

Notes for Principles of Colour Reproduction in Digital Images, Ep. 6

Notes for Principles of Colour Reproduction in Digital Images, Ep. 5

Notes for Principles of Colour Reproduction in Digital Images, Ep.4

Notes for Principles of Colour Reproduction in Digital Images, Ep.3

Notes for Principles of Color Reproduction in Digital Images, Ep.2

Notes for Principles of Colour Reproduction in Digital Images, Ep.1

Notes for Principles of Colour Reproduction in Digital Images, Ep.0