[HN Gopher] Wide Gamut Color in CSS with Display-P3
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Wide Gamut Color in CSS with Display-P3
Author : chmaynard
Score : 43 points
Date : 2020-03-02 19:16 UTC (3 hours ago)
(HTM) web link (webkit.org)
(TXT) w3m dump (webkit.org)
| teilo wrote:
| So, does this gracefully degrade to sRGB? If so, how does one set
| the rendering intent for degrading to sRGB? One needs to be able
| to choose either relative colorimetric or perceptual (absolute
| colorimetric and presentation are fairly uncommon), but which one
| depends on the intent of the designer.
|
| Or is one expected to provide two different color values for
| every element? That would be tedious.
| duhi88 wrote:
| Neat, but I find it hard to believe devs are going to reach for
| this verbose format without a default fallback.
|
| hsl is a much nicer syntax for humans to describe color than rgb
| channels.
|
| I'm sure there are good reasons under the hood, but why that
| syntax over something like:
|
| ``` header { color: hsl(42, 70%, 50%); color: hsl(display-p3 42,
| 70%, 50%); } ```
| jfkebwjsbx wrote:
| What about giving colors in 16bpp in linear space instead?
|
| That covers way more displays and future ones, no?
| Asooka wrote:
| No, because this expands colours to ones that cannot be
| expressed with sRGB, no matter if it's encoded as 16bit linear,
| or with the sRGB transfer function. You cannot express a hue
| outside the Rec.709 triangle, no matter how much precision you
| add (1).
|
| Display-P3 uses points in CIE xyz space for its RGB channels
| that are farther apart than sRGB, allowing it to express more
| hues, which sRGB monitors and colours cannot. It's still not
| the full spectrum humans can see, but it's much better.
|
| (1) technically you can, if you allow channel values to be
| negative, but that breaks compositing.
| VoxPelli wrote:
| That just describes how precise of a value between 0 and 100%
| for each Red, Green and Blue channel you can define, it doesn't
| change what Red, Green and Blue a 100% actually represents.
|
| The color profile defines what your definition actually
| represents and translates your 0-100% value to an actual color
| on the display.
| saagarjha wrote:
| > There are also numerous devices that support Display-P3 color
| space but currently have no browsers that support Display-P3 in
| CSS
|
| I wonder if someone could build WebKit for them.
| Sephr wrote:
| This is nice, but can I use it with an HDR monitor without
| forking over $7000 for an Apple Pro Display XDR?
|
| I haven't been able to confirm whether or not Mac OS Catalina
| actually supports any third party HDR monitors over HDMI.
|
| I have the Asus PG27UQ 4K HDR monitor and my 2019 MacBook Pro
| only outputs 4K 30Hz 8bpc over the official Apple HDMI
| adapter[1], while my 2019 XPS 13 2-in-1 outputs 4K 60Hz 10bpc
| over this same Apple adapter.
|
| [1] https://www.apple.com/shop/product/MUF82AM/A/usb-c-
| digital-a...
| TheCoreh wrote:
| They mention the "LG UltraFine 5K Display" on the page, maybe
| it's the only one supported? Maybe there's more
| [deleted]
| MBCook wrote:
| I have some sort of Dell at home that I believe I tested and
| works properly.
|
| But then again I'm using DisplayPort. I don't know why people
| are so insistent on using HDMI and being surprised it doesn't
| work as well.
| Sephr wrote:
| I save the DisplayPort port on this monitor for my Windows
| desktop because Mac OS doesn't appear to output the 4K 98Hz
| HDR that the Asus PG27UQ naively supports over DisplayPort
| 1.4.
| l33tbro wrote:
| Catalina will support any HDR monitor. You would just need a
| HDMI splitter and run it into your monitor.
|
| Alternatively, pop a Blackmagic Decklink 4k into a PCIe chasis
| and run it out of one of the thunderbolt 3 ports. I do this on
| my HDR OLED and it works nicely.
| Sephr wrote:
| Are you able to get a 4K HDR signal through the official
| Apple HDMI adapter to your HDR OLED display, or only through
| your Blackmagic Decklink 4K?
|
| I am using the official Apple HDMI adapter with the Asus
| PG27UQ.
| l33tbro wrote:
| My Decklink Mini 4k was under $200 and does the job.
|
| I don't know about your Apple adapter. Were it not working,
| then I would look at getting a HDCP splitter midway in the
| chain.
| VoxPelli wrote:
| If someone needs to read up on color profiles:
| https://bjango.com/articles/colourmanagementgamut/
|
| Eg. important to configure ones design tools like Sketch and
| Photoshop correctly so that it interprets RGB values as intended
| rather than just in the current color profile
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