Why does Photoshop Curves with 16-bit color depth always use the tonal range 0 – 255?

16 bit is only used for internal calculations. What you actually see on your monitor is 8-bit. Since an 8-bit monitor can only display 256 levels (0-255) and cannot display the difference between two 16-bit values ​​which are both converted to the same 8-bit value, the GUI uses 8-bit values. (Even if you use a 10-bit monitor and a graphics card, Photoshop only uses 8 bits per channel to display colors.)

If your monitor could differentiate the 65,536 levels, it still couldn't draw a detailed curve on your screen with only 1080 (FHD), 1440 (2K), or even 2880 (8K) vertical resolution lines to work with. Not to mention that your input device would also be limited to much less than that amount of detail, and even if it weren't, your hands or fingers operating a mouse, stylus, scroll wheel, etc. do not have enough precise movement to take advantage of anywhere near many different unique positions.

The main purpose of using 16-bit values ​​internally is to reduce the effect of rounding errors when multiple operations are performed on the raw data. This reduces things like banding and posterization when the response curves are stretched or compressed. The actual output will always end with a much lower bit depth because our display systems are far from being able to make such fine distinctions between colors.

The two most voted responses to What is the point of capturing 14-bit images and editing them on 8-bit monitors? delve deeper into the underlying principles as to why it makes sense to keep the finest increments until the image is rendered on a screen. There is no need to rewrite it all here.

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photoshop – "An integer between 0 and 255 is required" when I change the value in the RGB selector

The values ​​used internally are 16 bits. However, the GUI only uses 8-bit values. You can also see it in levels, curves, etc.

However, when you enter 255, this is actually converted to 65535 (or at least a value> 65280, I don't know their exact algorithm).

Yes, it means that only 256 of these 64,000 colors are directly digitally accessible to you. You can complain at Adobe …

python – OpenCV Each pixel in the return image of the adaptiveThreshold function is 255

I apply adaptive thresholding to a grayscale image and I would like to apply normal thresholding to the return image of this function. It doesn't work because every pixel in the return image is set to 255. I don't understand why, because imshow displays the return image from the adaptive threshold as you would expect, and it responds to parameter changes. So why is every 255 pixel and why am I unable to get results by putting this image into the normal threshold function?

I am using opencv 4.0.0.

image = cv2.imread('../photos/neptune.jpg', 0)
th2 = cv2.adaptiveThreshold(image, 255, cv2.ADAPTIVE_THRESH_GAUSSIAN_C, cv2.THRESH_BINARY, 3, 2)

# doesnt matter what second parameter is.
_, thresh = cv2.threshold(th2, 200, 255, cv2.THRESH_BINARY)

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LIVE ~ 167.99.60.252:9050 | 0.281 | High value | TX | 76104 | United States | Checked at vn5socks.net
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FireHeaven
Reviewed by FireHeaven sure
.
[Vn5socks.net] Automatic update 24h / 24 and 7/7 – good socks 11h25
LIVE ~ 139.162.76.176:9050 | 0,102 | Rotterdam | 11 | Unknown | Netherlands | Checked at vn5socks.net
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LIVE ~ 167.71.191.155:9070 | 0.28 | New York | NY | 10020

Evaluation: 5

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FireHeaven
Review by FireHeaven sure
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[Vn5socks.net] Automatic update 24h / 24 and 7/7 – Good socks 09h00
LIVE ~ 50.62.35.16:10979 | 0,254 | Scottsdale | AZ | 85260 | United States | Checked at vn5socks.net
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Evaluation: 5

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timer – C # Winforms The value 256 is not valid for red. red must be greater than or equal to 0 and less than or equal to 255

I have a problem when I try to create an RGB splash screen. However, the System.ArguementException error displays: The value of & # 39; 256 & # 39; is not a valid option for the "red". & # 39; red & # 39; must be greater than or equal to 0 and less than or equal to 255. It does so for all parties. Red, green and blue and I do not know how to fix it. I've also tried to rewrite the code, but nothing seems to work.

My code:

    int r = 244;
    int g = 65;
    int b = 65;


    private void Loader_Load(object sender, EventArgs e)
    {
         timerB.Start();
    }

    private void TimerR_Tick(object sender, EventArgs e)
    {
        if (b >= 244)
        {
            r -= 1;
            Label.ForeColor = Color.FromArgb(r, g, b);
            if (r <= 65)
            {
                timerR.Stop();
                timerG.Start();
            }
        }
        if (b <= 65)
        {
            r += 1;
            Label.ForeColor = Color.FromArgb(r, g, b);
            if (r >= 244)
            {
                timerR.Stop();
                timerG.Start();
            }
        }
    }

    private void TimerG_Tick(object sender, EventArgs e)
    {
        if (r <= 65)
        {
            g += 1;
            Label.ForeColor = Color.FromArgb(r, g, b);
            if (g >= 244)
            {
                timerG.Stop();
                timerB.Start();
            }
        }
        if (r >= 244)
        {
            g -= 1;
            Label.ForeColor = Color.FromArgb(r, g, b);
            if (g <= 65)
            {
                timerG.Stop();
                timerB.Start();
            }
        }
    }

    private void TimerB_Tick(object sender, EventArgs e)
    {
        if (g <= 65)
        {
            b += 1;
            Label.ForeColor = Color.FromArgb(r, g, b);
            if (b <= 65)
            {
                timerB.Stop();
                timerR.Start();
            }
        }
        if (g > -244)
        {
            b -= 1;
            Label.ForeColor = Color.FromArgb(r, g, b);
            if (b <= 255)
            {
                timerB.Stop();
                timerR.Start();
            }
        }
    }

}  

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What is the advantage of setting the column SSN varchar (32) on varchar (255)

What is the benefit of defining the SSN column varchar(32) more than varchar(255) even if two of them consumes memory on one byte?

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FireHeaven
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[Vn5socks.net] Automatic update 24 hours a day, 7 days a week – good socks
LIVE ~ 124.65.145.126:7302 | 0,06 | Beijing | 22 | Unknown | China | Checked at vn5socks.net
LIVE ~ 47.254.25.174:25333 | 0,189 | Ottawa | ON | k1y4h7 | Canada | Checked at vn5socks.net
LIVE ~ 188.165.236.46:1088 | 0,257 | Unknown | Unknown | Unknown | France | Checked at vn5socks.net
LIVE ~ 95.110.186.48:10175 | 0.199 | Unknown | Unknown | Unknown | Italy | Checked at vn5socks.net
LIVE ~ 167.99.170.63:9050 | 0,233 | Fort Worth | TX | 76104 | United States |

Evaluation: 5

.