How to change label forecolour based on the background

Question

ie. if the background is white the label textcolour should be white and vice versa

im using the following code bgDelta is always 0 and the colour varies but in case of white background the label colour is also white.

public Color IdealTextColor(Color bg)
   {
       int nThreshold = 105;
       int bgDelta = Convert.ToInt32((bg.R * 0.299) + (bg.G * 0.587) + (bg.B * 0.114));
       Color fColor = (105 - bgDelta < nThreshold) ? Color.Black : Color.White;
       return fColor;
   }

hello unlucky please let me know it there is any solution – Danish Kp Nov 30 '16 at 09:15 — Danish Kp, Nov 30 '16 at 09:15

huse.ckr · Accepted Answer · 2016-11-30T09:24:04.657

0

When I debug I got it black;

//bg.R=255, bg.G=255, bg.B=255
bgDelta=76.245 + 149.685 + 29.07= 255
105 - bgDelta=-150
result=Color.Black

Code;

IdealTextColor(Color.White);
...
public Color IdealTextColor(Color bg){
int nThreshold = 105;
int bgDelta = Convert.ToInt32((bg.R * 0.299) + (bg.G * 0.587) + (bg.B * 0.114));
Color fColor = (105 - bgDelta < nThreshold) ? Color.Black : Color.White;
return fColor;}

Better Approach;

double fcolor = 1 - ( 0.299 * color.R + 0.587 * color.G + 0.114 * color.B)/255;

edited Nov 30 '16 at 09:24

answered Nov 30 '16 at 07:04

huse.ckr

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the fact is the bgdelta is always 0 and u would only get black – Danish Kp Nov 30 '16 at 09:13
You could use different algorithm: [Determine font color based on background color](http://stackoverflow.com/a/1855903/3060520) – huse.ckr Nov 30 '16 at 09:21

score 0 · Answer 2 · answered Dec 01 '16 at 12:35

0

lable.ForeColor = form.BackColor

answered Dec 01 '16 at 12:35

andy

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i meant not to back color based on back color – Danish Kp Dec 02 '16 at 05:51

How to change label forecolour based on the background

2 Answers2