[SOLVED] Weird question: how can I make everything look green? I mean everything. Everything on my display.

[James_Smith]

I get migraines. Sometimes I have them 20 or more days per month. Then again, sometimes I go for months with none. The worst I've ever had was 27 days of migraines, one day of relief, and then 27 more days. That was back in 2010.

What does this have to do with Linux and the color green? Well, it turns out that there is some good scientific evidence that green light relieves migraine pain while blue light exacerbates it. Interestingly, blue light shined into the eyes of blind people with migraines will exacerbate their pain. Here is an article on the subject.

Fortunately, most of my migraine headaches are quite mild but working on the computer does cause the pain to ramp up. If I could make my display greenish, it might actually ease the pain rather than make it worse.

So, how do I do this? I went into Settings > Hardware > Color and I see this thing that says I need to create a color profile. I click "Add Profile" and little box pops up that says Available Profiles for Displays with a whole bunch of options. I don't know what I'm doing. Can someone walk me through it?

Also, keep in mind that this green screen thing I want to do should be easily reversible. Right now I don't have a headache at all so I won't need it. Tomorrow I might have one, so I'd like to be able to click a few things and make the display green.

Basically, I'm imagining that it would look like this...


Here's my machine's hw/sw information:

Code: Select all

mac@mac-Alienware-15-R3 ~ $ inxi -Fxzd
System:    Host: mac-Alienware-15-R3 Kernel: 4.13.0-19-generic x86_64 (64 bit gcc: 5.4.0)
           Desktop: Cinnamon 3.6.6 (Gtk 3.18.9-1ubuntu3.3) Distro: Linux Mint 18.3 Sylvia
Machine:   System: Alienware product: Alienware 15 R3 v: 1.0.8
           Mobo: Alienware model: Alienware 15 R3 v: A00
           Bios: Alienware v: 1.0.8 date: 02/24/2017
CPU:       Quad core Intel Core i7-7700HQ (-HT-MCP-) cache: 6144 KB
           flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 22464
           clock speeds: max: 3800 MHz 1: 2800 MHz 2: 2800 MHz 3: 2800 MHz 4: 2800 MHz
           5: 2800 MHz 6: 2800 MHz 7: 2800 MHz 8: 2800 MHz
Graphics:  Card-1: Intel Device 591b bus-ID: 00:02.0
           Card-2: NVIDIA Device 1c20 bus-ID: 01:00.0
           Display Server: X.Org 1.18.4 driver: nvidia Resolution: 1920x1080@60.02hz
           GLX Renderer: GeForce GTX 1060/PCIe/SSE2
           GLX Version: 4.5.0 NVIDIA 384.90 Direct Rendering: Yes
Audio:     Card Intel Device a171 driver: snd_hda_intel bus-ID: 00:1f.3
           Sound: Advanced Linux Sound Architecture v: k4.13.0-19-generic
Network:   Card-1: Qualcomm Atheros Device e0b1 driver: alx port: d000 bus-ID: 3c:00.0
           IF: enp60s0 state: down mac: <filter>
           Card-2: Qualcomm Atheros QCA6174 802.11ac Wireless Network Adapter
           driver: ath10k_pci bus-ID: 3d:00.0
           IF: wlp61s0 state: up mac: <filter>
           Card-3: Atheros usb-ID: 001-003
           IF: null-if-id state: N/A speed: N/A duplex: N/A mac: N/A
Drives:    HDD Total Size: 2000.4GB (56.7% used)
           ID-1: /dev/sda model: Crucial_CT1024MX size: 1000.2GB temp: 40C
           ID-2: USB /dev/sdb model: TOURO_S size: 1000.2GB temp: 0C
           Optical: No optical drives detected.
Partition: ID-1: / size: 910G used: 218G (26%) fs: ext4 dev: /dev/sda1
           ID-2: swap-1 size: 8.45GB used: 0.00GB (0%) fs: swap dev: /dev/dm-0
RAID:      No RAID devices: /proc/mdstat, md_mod kernel module present
Sensors:   System Temperatures: cpu: 56.5C mobo: N/A gpu: 0.0:53C
           Fan Speeds (in rpm): cpu: N/A
Info:      Processes: 266 Uptime: 15:55 Memory: 5787.2/15913.4MB
           Init: systemd runlevel: 5 Gcc sys: 5.4.0 Client: Shell (bash 4.3.481) inxi: 2.2.35

[catweazel]

You don't say if you're using a laptop or an external monitor. If the latter, you can use the montor's settings to make everything green.

[James_Smith]

You don't say if you're using a laptop or an external monitor. If the latter, you can use the montor's settings to make everything green.

Ah, yes, sorry. It's an Alienware R 15. I'll put the hw/sw info in the first post.

[all41]

You can set the screen rgb in the terminal using xgamma:

Code: Select all

xgamma

This will show the present rgb values--most likely 1.000 for each.
These can be changed and you will probably want to reduce the setting for red and blue.

Code: Select all

man xgamma

will explain how

[trytip]

if you have nvidia installed use nvidia-settings then select your monitor > color correction then go crazy with the colors

[James_Smith]

You can set the screen rgb in the terminal using xgamma:

Code: Select all

xgamma

This will show the present rgb values--most likely 1.000 for each.
These can be changed and you will probably want to reduce the setting for red and blue.

Code: Select all

man xgamma

will explain how

Ok, I can't figure out how to do it. I found this, of course:

Code: Select all

-rgamma f.f
               This  argument specifies the red component of the gamma correc‐
               tion.

       -ggamma f.f
               This argument specifies the green component of the  gamma  cor‐
               rection.

       -bgamma f.f
               This argument specifies the blue component of the gamma correc‐
               tion

But I have no idea what to do with this information.

if you have nvidia installed use nvidia-settings then select your monitor > color correction then go crazy with the colors

I do have it. I clicked on the program and didn't see any place to select my monitor nor could I find anyway to do a color correction.

Man, I thought I was getting the hang of this

[catweazel]

I clicked on the program and didn't see any place to select my monitor nor could I find anyway to do a color correction.

Select your GPU and monitor in the left panel. There is a colour correction tab in the right panel.

[trytip]

[James_Smith]

I clicked on the program and didn't see any place to select my monitor nor could I find anyway to do a color correction.

Select your GPU and monitor in the left panel. There is a colour correction tab in the right panel.

I've clicked everything and I can't see colour correction anywhere.

What am I doing wrong?

[catweazel]

What am I doing wrong?

Nothing. You're using nvidia prime, which is used to support hybrid Intel and nvidia GPUs. That would explain why you don't get the tab. You'll have to wait for someone with experience in that setup. Sorry, I can't help you further.

[James_Smith]

What am I doing wrong?

Nothing. You're using nvidia prime, which is used to support hybrid Intel and nvidia GPUs. That would explain why you don't get the tab. You'll have to wait for someone with experience in that setup. Sorry, I can't help you further.

Ok, well I appreciate you trying. Thank you.

[catweazel]

Ok, well I appreciate you trying. Thank you.

That's kind of you. Cheers.

[all41]

Ok, I can't figure out how to do it. I found this, of course:

Code: Select all

-rgamma f.f
               This  argument specifies the red component of the gamma correc‐
               tion.

       -ggamma f.f
               This argument specifies the green component of the  gamma  cor‐
               rection.

       -bgamma f.f
               This argument specifies the blue component of the gamma correc‐
               tion

But I have no idea what to do with this information.

Try this to see how to set them:

Code: Select all

xgamma -r 0.1; xgamma -g 1.0; xgamma -b 0.1

This will definitely be green.

To reverse this and get back to normal:

Code: Select all

xgamma -r 1.0; xgamma -g 1.0; xgamma -b 1.0

[James_Smith]

Try this to see how to set them:

Code: Select all

xgamma -r 0.1; xgamma -g 1.0; xgamma -b 0.1

This will definitely be green.

To reverse this and get back to normal:

Code: Select all

xgamma -r 1.0; xgamma -g 1.0; xgamma -b 1.0

Ah, ok now I understand. Thank you.