Changing Colors And Hues
Can I, In Java, Change the color of a picture to a specific color of another picture? like I got two pictures, one in orange and one got blue and brown, I want to change the hues of the blue and brown picture to make the dominated color of the orange picture its color. Like A Sword From A Game, I want to change the color of that blue sword to orange and generate the png
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Do you want to change the color of an individual pixel?
Or do you want to change the averag hue?
Like the average hue
If you want to change the average hue from image A to the average hue of image B, you can do the following:
- You calculate the average hues of A and B
- You divide the average hue of B by the average hue of A
- For every pixel of A, you multiply the hue with that
- You clamp the result to ensure it doesn't go out of bounds
Do you want to do it programmatically or not?
So you mean I get the RGB for the hues, the width and the height to clamp?
I meant HSV and not RGB
Oh okay. Because when I tried doing it I used RGB
then the hue is the first component
and when I said clamping, I meant ensuring it doesn't go above 255
Aha.
You do want to do it programmatically, right?
Yeah. What else?
well if you just want to do it on a few images, you could just do it in Gimp or similar
though note that multiplication might not be ideal
Well. I use it on 5 images each time I run the program
adding might be better - or maybe you'd need another operation
I generate 5 images. From 1 image
Why every time you run the program?
Isn't the input image always the same?
No.
The Input image changes when I want to generate other images
yeah I thought about just changing the color balance in gimp or similar lol
But I thought of other way. I can open a pixel editor and change the hues till I find the appropriate one. Then just make a program that changes the hue of an image by passing in an array with paths and the new hue like 0.8
But that won't be fully automated but why not.
well the images contain many different colors, right?
No.
oh?
Do you just want to replace a single color?
Like I got an image containing an Aluminum Ingot Pixel Art. Mostly Light Grey. And I got tools that is mostly blue. I want to change those blue to mostly light grey. Like it's different shades of blue, such as cyan and darker versions of cyan
So all stuff are one color but different shades
So I just want to change the color of the tools to like the ingot
yeah get the image as hsv and then the hue (h) value should be the same for all relevant pixels (if the color is actually the same)
and then you can just change that hue value to whatever you like
Well I am not on my laptop right now so I can't really check. Is there a method to get that in The BufferedImage class?
I think
BufferedImageOp/ColorConvertOp can be used for thatOh well I think I need to get the RGB then convert it to HSV
image.getRGB(x, y)
inside of a nested loop for x and y.
Color color = new Color(rgb) rbg is a variable storing that image.getRGB(x, y)
float[] hsv = Color.RGBtoHSB(color.getRed(), color.getGreen(), color.getBlue(), null);
Idk if I am spitting non-sense
Dude I just found out how to use it. Just get the HSV. Change the Hue value. Turn it back to RGB. Put the RGB of the image to the new RGB
hsv[0] is the hue. So I can shift it by adding the shift amount. hsv[0] += 0.5fshould be fine
Then returning it to RGB using the Color class HSBtoRGB method.
yes
Then using the ImageIO class to write the new png
Gosh I talk a lot
though you might have the case that the hue is not exactly the same
Okay Thanks dan1st
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e.g. 123 vs 124
What?
if you have two pixels with different lightness, it could be that the hue of one is 0.123 and the other is .124
you'd probably want to consider these as the same hue
But when I change the hue. I want the same lightness to be there
Like when I change it to grey. I don't want the whole image grey or something. I want only to change the color to grey with the lightness the same
yes but there may be some numerical precision issues in the RGB to HSB conversion
so you might end up with numbers that are almost the same but not exactly
Like I want that light blue to be light grey. And that dark blue to be dark grey
Sooo is it an issue?
you should be aware of it when implementing it
Okay. I would try the first way of getting the HSV then making some conversions. If it didn't work, I will just manually figure out the needed hue then make a method to change the hue of an Image
Note: If you are working with int values, these are typically between 0 and 255 - for
floats, they are typically between 0 and 1
and I think a hue of 0 is (practically) the same as a hue of 1
because of how hue worksYeah I found out about something called Alpha and stuff. If it was 0 the pixel is transparent. Like when you use a background remover
Idk if they are the same as you are talking about
Yeah. I know that
yeah but I think you don't need it if you don't have transparent images
All of my images got transparent pixels ;—;
then you should use RGBA and HSVA
This image is transparent but I changed it to send it on telegram then here
or just save the alpha, use the RGB/HSV ignoring the alpha and then use the same alpha again
I wouldn't have seen a difference
Lol. I am in Dark mode that is why
Well. Thanks for the Help Daniel. I will try both ways.
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The Help Forum is marked as Minecraft modding. So the tools and the stuff are Minecraft stuff. That is why they are transparent
I have no idea about Minecraft modding lol
They are just textures 🙂
Okay have a great day/night
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