JacksBlog: JackChou00's Blog, Colour Science, Photography and Tech Sharinghttps://jackchou00.com/enhttps://img.jackchou.top/jack-img/2025/08/81bb602c03f9704ee42e292468396187.webphttps://img.jackchou.top/jack-img/2025/08/81bb602c03f9704ee42e292468396187.webphttps://jackchou00.com/en/posts/photo-compress-beta/https://jackchou00.com/en/posts/photo-compress-beta/With hard drives this pricey, every little helpsWed, 15 Jul 2026 15:30:00 GMThttps://jackchou00.com/en/posts/dji-dlog2-dgamut2-analysis/https://jackchou00.com/en/posts/dji-dlog2-dgamut2-analysis/For unprecedented high dynamic range and a colour space better suited to wide gamutsFri, 26 Jun 2026 00:00:00 GMThttps://jackchou00.com/en/posts/apply-lut-in-python/https://jackchou00.com/en/posts/apply-lut-in-python/Differences in speed and accuracy when applying 3D LUTs using colour-science, Pillow, OpenColorIO, and PyTorch.Sat, 13 Jun 2026 00:00:00 GMThttps://jackchou00.com/en/posts/hdr-conversion-gainmap/https://jackchou00.com/en/posts/hdr-conversion-gainmap/Testing and notes on the Gainmap reading and application parts of HDR Conversion version 0.1.5Sun, 31 May 2026 14:59:18 GMThttps://jackchou00.com/en/posts/x2d-camera-screen/https://jackchou00.com/en/posts/x2d-camera-screen/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.Tue, 12 May 2026 13:00:00 GMThttps://jackchou00.com/en/posts/oppo-log-2-review/https://jackchou00.com/en/posts/oppo-log-2-review/The similarity check rate is a bit high.Wed, 06 May 2026 14:00:00 GMThttps://jackchou00.com/en/posts/adobe-lossyjxl-dng/https://jackchou00.com/en/posts/adobe-lossyjxl-dng/Some interesting details about lossy compression of DNG files using JXL in Adobe DNG Converter.Mon, 20 Apr 2026 15:00:00 GMThttps://jackchou00.com/en/posts/windows-wide-colour-gamut/https://jackchou00.com/en/posts/windows-wide-colour-gamut/Two approaches to achieving basic wide colour gamut management on Windows.Mon, 13 Apr 2026 14:00:00 GMThttps://jackchou00.com/en/posts/dxo-compressed-dng/https://jackchou00.com/en/posts/dxo-compressed-dng/The technical details and implementation of DXO PureRAW 6's high-fidelity compressed DNG files.Mon, 06 Apr 2026 15:00:00 GMThttps://jackchou00.com/en/posts/icdt-2026/https://jackchou00.com/en/posts/icdt-2026/Tools page for ICDT 2026Thu, 02 Apr 2026 18:00:00 GMThttps://jackchou00.com/en/posts/get-metadata-from-heif/https://jackchou00.com/en/posts/get-metadata-from-heif/Talk is Cheap, Show me Your Prompt.Wed, 18 Mar 2026 15:00:00 GMThttps://jackchou00.com/en/posts/cmf-transition-bridge-spectra/https://jackchou00.com/en/posts/cmf-transition-bridge-spectra/Switching standard colour spaces over to new colour matching functions by constructing bridge spectraThu, 12 Mar 2026 15:50:00 GMThttps://jackchou00.com/en/posts/extract-icc-from-file/https://jackchou00.com/en/posts/extract-icc-from-file/A simple, universal method based on ICC file structure features, without relying on specific image formatsThu, 26 Feb 2026 12:00:00 GMThttps://jackchou00.com/en/posts/iphone-heic-hdr-format/https://jackchou00.com/en/posts/iphone-heic-hdr-format/Analysing HDR images in iPhone photos in HEIC format to understand their structure, decoding, and conversion process.Thu, 19 Feb 2026 15:00:00 GMThttps://jackchou00.com/en/posts/wrong-baseline-headroom/https://jackchou00.com/en/posts/wrong-baseline-headroom/Baseline Headroom in ISO 21496-1: A Bug and Some Curious FindingsSun, 01 Feb 2026 15:50:00 GMThttps://jackchou00.com/en/posts/jacksblog-first-anniversary/https://jackchou00.com/en/posts/jacksblog-first-anniversary/Fly me to the moon. Let me play among the stars. Let me see what spring is like on Jupiter and Mars.Sun, 18 Jan 2026 08:00:00 GMThttps://jackchou00.com/en/posts/hisense-rgbc-miniled-analysis/https://jackchou00.com/en/posts/hisense-rgbc-miniled-analysis/How the added cyan LED affects gamut coverage and its potential impact on human circadian rhythmSat, 10 Jan 2026 00:00:00 GMThttps://jackchou00.com/en/posts/dng-bit-packing-numpy/https://jackchou00.com/en/posts/dng-bit-packing-numpy/Understanding 10/12/14-bit image packing algorithms and solving Numpy slice alignment and padding issuesFri, 02 Jan 2026 16:33:13 GMThttps://jackchou00.com/en/posts/iso-gainmap-alternate-headroom/https://jackchou00.com/en/posts/iso-gainmap-alternate-headroom/A seemingly redundant parameter: The role and correct writing method of Alternate HDR Headroom in the ISO 21496-1 standardWed, 17 Dec 2025 15:08:09 GMThttps://jackchou00.com/en/posts/a7m5-manual-raw-to-dng/https://jackchou00.com/en/posts/a7m5-manual-raw-to-dng/Use LibRAW to break down RAW components, then manually piece together a usable DNG file with PiDNG.Sun, 07 Dec 2025 10:30:00 GMThttps://jackchou00.com/en/posts/oppo-log-review/https://jackchou00.com/en/posts/oppo-log-review/Maybe it's just a selling point mentioned at a launch event, but surely no one takes it seriously?Mon, 24 Nov 2025 17:00:00 GMThttps://jackchou00.com/en/posts/imagecodecs-avif/https://jackchou00.com/en/posts/imagecodecs-avif/ImageCodecs now supports colour space and transfer function parameters.Mon, 10 Nov 2025 15:00:00 GMThttps://jackchou00.com/en/posts/geekon-darkvision-2700-unbox-preview/https://jackchou00.com/en/posts/geekon-darkvision-2700-unbox-preview/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.Thu, 23 Oct 2025 15:00:00 GMThttps://jackchou00.com/en/posts/wsl2-hyperv-install-fix/https://jackchou00.com/en/posts/wsl2-hyperv-install-fix/Notes in installation of WSL2 for Codex, unknown issue about Hyper-VWed, 15 Oct 2025 15:29:04 GMThttps://jackchou00.com/en/posts/wang-et-al-adaptive-tone-mapping/https://jackchou00.com/en/posts/wang-et-al-adaptive-tone-mapping/Breaking down an innovative tone mapping algorithm and exploring how it balances luminance compression with detail preservation.Mon, 22 Sep 2025 16:30:00 GMThttps://jackchou00.com/en/posts/zotero-workflow-and-philosophy/https://jackchou00.com/en/posts/zotero-workflow-and-philosophy/A guide to my Zotero setup, focusing on 'simplicity' and 'efficiency' with pluginsSat, 13 Sep 2025 16:00:00 GMThttps://jackchou00.com/en/posts/macadam-optimal-colour/https://jackchou00.com/en/posts/macadam-optimal-colour/A mathematical proof: what does the reflectance of a 'perfect pigment' look like?Sun, 07 Sep 2025 12:00:00 GMThttps://jackchou00.com/en/posts/iso-21496-1-gainmap-hdr/https://jackchou00.com/en/posts/iso-21496-1-gainmap-hdr/Say goodbye to messy proprietary formats — ISO 21496-1 brings a unified specification for Gainmap HDR imagesFri, 29 Aug 2025 19:00:00 GMThttps://jackchou00.com/en/posts/x2dii-preview/https://jackchou00.com/en/posts/x2dii-preview/Finished the UltraHDR article yesterday, only to have the X2D II release today and use it.Tue, 26 Aug 2025 15:00:00 GMThttps://jackchou00.com/en/posts/hdr-format-ultrahdr-mpf/https://jackchou00.com/en/posts/hdr-format-ultrahdr-mpf/A backwards-compatible HDR image scheme based on dual-layer JPEG and Gainmap, now widely adoptedMon, 25 Aug 2025 17:00:00 GMThttps://jackchou00.com/en/posts/jpeg-structure/https://jackchou00.com/en/posts/jpeg-structure/A deep dive into the structure of JPEG and the modifications made to support new featuresSat, 23 Aug 2025 18:00:00 GMThttps://jackchou00.com/en/posts/llm-for-colour/https://jackchou00.com/en/posts/llm-for-colour/Sharing tips for collaborating with general-purpose LLMs in this field, and tests.Wed, 20 Aug 2025 18:00:00 GMThttps://jackchou00.com/en/posts/gainmap-image-intro/https://jackchou00.com/en/posts/gainmap-image-intro/Achieving HDR while ensuring excellent backward compatibility by packaging SDR and HDR images within a single file.Mon, 18 Aug 2025 16:00:00 GMThttps://jackchou00.com/en/posts/cat16-reversibility/https://jackchou00.com/en/posts/cat16-reversibility/Details in colour adaptation models similar to CAT16: one forward and one reverse, achieving reversibility and transferenceThu, 07 Aug 2025 10:00:00 GMThttps://jackchou00.com/en/posts/badge-and-blog-workflow/https://jackchou00.com/en/posts/badge-and-blog-workflow/Using a badge to roughly show visitor count, and my general process for updating blog postsSun, 03 Aug 2025 18:00:00 GMThttps://jackchou00.com/en/posts/sony-camera-screen/https://jackchou00.com/en/posts/sony-camera-screen/A small, practical method for testing the internal screen of Sony cameras and a hands-on example.Fri, 01 Aug 2025 04:00:00 GMThttps://jackchou00.com/en/posts/git-rm-files/https://jackchou00.com/en/posts/git-rm-files/To be honest, I do this so often myself that I had to write something as a reminder (and for my own future reference).Sat, 28 Jun 2025 17:03:00 GMThttps://jackchou00.com/en/posts/pcrdi07/https://jackchou00.com/en/posts/pcrdi07/Notes for Principles of Colour Reproduction in Digital Images, Ep. 7Wed, 04 Jun 2025 15:30:00 GMThttps://jackchou00.com/en/posts/bt2408/https://jackchou00.com/en/posts/bt2408/Some tedious definitions, with love from BT.2408Sun, 25 May 2025 18:00:00 GMThttps://jackchou00.com/en/posts/icam06-survey/https://jackchou00.com/en/posts/icam06-survey/Python Implementation of Image Colour Appearance Model (iCAM06)Tue, 13 May 2025 12:00:00 GMThttps://jackchou00.com/en/posts/hdr-format-conversion/https://jackchou00.com/en/posts/hdr-format-conversion/Conversion of HDR still image formatsThu, 24 Apr 2025 16:00:00 GMThttps://jackchou00.com/en/posts/colour-checker-for-jpg/https://jackchou00.com/en/posts/colour-checker-for-jpg/Reflections on learning to analyse image colour using Imatest and colour chartsWed, 02 Apr 2025 05:30:00 GMThttps://jackchou00.com/en/posts/how-to-read-raw/https://jackchou00.com/en/posts/how-to-read-raw/Running fast doesn't guarantee a win; avoiding pitfalls is true success.Thu, 27 Mar 2025 16:00:00 GMThttps://jackchou00.com/en/posts/display-reflectance/https://jackchou00.com/en/posts/display-reflectance/Potentially a more effective improvement than class-leading screen brightness and aggressive tuning algorithms.Fri, 14 Mar 2025 08:00:00 GMThttps://jackchou00.com/en/posts/isp-01/https://jackchou00.com/en/posts/isp-01/Decrypting the RAW Colour Cipherbook: CCM Parameter Alchemy and Constructing the sRGB Portal MethodologyMon, 03 Mar 2025 16:00:00 GMThttps://jackchou00.com/en/posts/ccm-02-raw-xyz/https://jackchou00.com/en/posts/ccm-02-raw-xyz/Converting RAW to XYZSat, 01 Mar 2025 16:00:00 GMThttps://jackchou00.com/en/posts/ccm-01-rgb-xyz/https://jackchou00.com/en/posts/ccm-01-rgb-xyz/Building a matrix to implement conversions between XYZ and RGB spaces defined on XYZ.Sat, 22 Feb 2025 16:00:00 GMThttps://jackchou00.com/en/posts/pcrdi06/https://jackchou00.com/en/posts/pcrdi06/Notes for Principles of Colour Reproduction in Digital Images, Ep. 6Thu, 20 Feb 2025 16:00:00 GMThttps://jackchou00.com/en/posts/pcrdi05/https://jackchou00.com/en/posts/pcrdi05/Notes for Principles of Colour Reproduction in Digital Images, Ep. 5Thu, 06 Feb 2025 16:00:00 GMThttps://jackchou00.com/en/posts/pcrdi04/https://jackchou00.com/en/posts/pcrdi04/Notes for Principles of Colour Reproduction in Digital Images, Ep.4Sun, 02 Feb 2025 16:00:00 GMThttps://jackchou00.com/en/posts/pcrdi03/https://jackchou00.com/en/posts/pcrdi03/Notes for Principles of Colour Reproduction in Digital Images, Ep.3Fri, 31 Jan 2025 16:00:00 GMThttps://jackchou00.com/en/posts/pcrdi02/https://jackchou00.com/en/posts/pcrdi02/Notes for Principles of Color Reproduction in Digital Images, Ep.2Fri, 24 Jan 2025 16:00:00 GMThttps://jackchou00.com/en/posts/pcrdi01/https://jackchou00.com/en/posts/pcrdi01/Notes for Principles of Colour Reproduction in Digital Images, Ep.1Mon, 20 Jan 2025 16:00:00 GMThttps://jackchou00.com/en/posts/pcrdi00/https://jackchou00.com/en/posts/pcrdi00/Notes for Principles of Colour Reproduction in Digital Images, Ep.0Mon, 20 Jan 2025 10:00:00 GMT