Qi Linzhi

prev. @figma, @penn. he/him 🏳️‍🌈

[Qi Linzhi @LinzhiQ]

The package sets up a local server and a Cloudflare tunnel to let custom GPTs run almost all Shortcuts actions supported by macOS and read iMessages.

Everything stays private between you and your ChatGPT.

Here’s setting it up to help me coordinate my schedule with friends:

[Qi Linzhi @LinzhiQ]

We built a lil toy to give GPTs access to your Mac: https://t.co/KUZWnjAUof

Me: complain to my landlord for me and my roommates pls 🥺

GPT: (reads iMessage chat with roomies, summarizes complaints, finds our landlord’s email, pulls up a drafted email)

[Qi Linzhi @LinzhiQ]

@efedorenko Curious — what are some modern that support 30-bit colors?

[Qi Linzhi @LinzhiQ]

@efedorenko Hey Eugene! Yep it's correct that "total colors but stretched over a larger color space." 49% of the total colors were not possible before in sRGB.

[Qi Linzhi @LinzhiQ]

@MyndexResearch By ΔE³ I mean volume of the gamut in L*a*b* unit ΔE, which is defined as 1.0 = just-noticeable difference per CIELAB.

Colors across the luminance spectrum should have comparable ΔEs from quantization, if the gamma tone response curves work as designed. Need to investigate

[Qi Linzhi @LinzhiQ]

Today marks an exciting day in @figma history: we brought 49% more colors to the canvas (!!) 🎨🌈

Sounds intriguing? Let's unravel the engineering magic behind this... 🧵🪡" 1/

[Qi Linzhi @LinzhiQ]

@svgeesus @figma Hey Chris! The last tweet in my thread included ΔE³, which is (coincidentally) close to the % wrt our data model.

Perhaps I should have led with ΔE³. Both profile use D65 and γ 2.4 which is convex. I think (?) that means darker colors are overrepresented in the overlap in hex

[Qi Linzhi @LinzhiQ]

@markacianfrani We check for support with WebGLRenderingContext

[Qi Linzhi @LinzhiQ]

@MDillgen @figma It was possible to see P3 colors with "unmanaged" mode, but:
- Can't set color profile for each file
- Collaborators can't see the color profile you set
- Assets only export in sRGB
- Only works on desktop

And, there's the maintenance for "unmanaged":
https://t.co/dN0n0viFkw

[Qi Linzhi @LinzhiQ]

We started receiving features requests for designing with Display P3 colors in 2017, before any browser supported the standard.

As a workaround, our team maintained a @electronjs flag to pass through colors directly to the monitor without color management by Chromium... 4/

[Qi Linzhi @LinzhiQ]

@cerpow Yep. You can set the color profile in the export settings in the properties panel, or if your file is in P3, all exports will be in P3 by default.

https://t.co/j55Uwdufy3

[Qi Linzhi @LinzhiQ]

@markacianfrani Nope! Just React components styles with CSS, as opposed to colors in canvases.

[Qi Linzhi @LinzhiQ]

@ikeadrift Hey there! If you click on the chevron next to the filename, does it say "Display P3" under "File color profile"?

[Qi Linzhi @LinzhiQ]

sRGB has ~899,155 distinct colors, Display P3 has ~1,354,483 distinct colors (~50% more) to the average human eyes

(ΔE³ estimates from Monte Carlo simulations with ICCView by Tobias Huneke and argyllcms by Graeme Gill)

[Qi Linzhi @LinzhiQ]

Perceptual color distance can be measured with euclidean distance in L*a*b* space (ΔE), hence the # of perceptually distinct colors is the volume of the gamut.

Plugging the tristimulus coordinates (XYZ) of each primary of the two profiles, we can see from ΔE³ that... 11/