https://github.com/imane0x/hsla-images
https://github.com/imane0x/hsla-images
Last synced: 2 months ago
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- Host: GitHub
- URL: https://github.com/imane0x/hsla-images
- Owner: imane0x
- Created: 2021-10-17T08:55:04.000Z (over 3 years ago)
- Default Branch: main
- Last Pushed: 2021-10-22T18:37:51.000Z (over 3 years ago)
- Last Synced: 2025-01-27T08:42:48.981Z (4 months ago)
- Language: Objective-C
- Size: 7.81 MB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# HSLA Images
This project consists of manipulating images by adjusting the HSL color space properties (hue,saturation,luminance).
# Transformations:
## Saturation:
Changing the saturation by a specific amount using the following method:
void Image::saturate(double amount){
for(unsigned x = 0; x < width() ; x++){
for(unsigned y = 0; y < height(); y++)
{
//reference on the pixel
HSLAPixel &P = getPixel(x, y);
if(amount+P.s<=1 && P.s+amount>=0){
P.s += amount;
}else if(P.s+amount <0){
P.s =0;
}
else if(P.s+amount>1){
P.s =1;
}
}
## Rotating colors
Increasing the hue of each pixel by an angle using the following method:
void Image::rotateColor(double angle){
for(unsigned x = 0; x < width() ; x++){
for(unsigned y = 0; y < height(); y++){
{
HSLAPixel &P = getPixel(x, y);
P.h += angle;
if(P.h>=360){
while(P.h>=360){
P.h-=360;
}
}else if(P.h<0){
while(P.h<0){
P.h+=360;
}
}
}
}
}
}
## Lighten
Changing the luminance of each pixel by amount using :
void Image::lighten(double amount){
for(unsigned x = 0; x < width() ; x++)
for(unsigned y = 0; y < height(); y++)
{
//reference on the pixel
HSLAPixel &P = getPixel(x, y);
if(P.l+amount<=1 && P.l+amount>=0){
P.l += amount;
}else if(P.l+amount <0){
P.l =0;
}
else if(P.l+amount>1){
P.l =1;
}
}
}
## Grayscale
Eliminating all the colors and representing the image using only a grayscale level using:
Grayscale::Grayscale(string filename):Image(filename)
{
for(unsigned x = 0; x < width() ; x++)
for(unsigned y = 0; y < height(); y++)
{
//reference on the pixel
HSLAPixel &P = getPixel(x, y);
P.s =0;
//modifiy the element of P
}
}
## Illini
Replacing the hue of each pixel by either the first or the second color that were defined as attributes.The choice is based on the closest color.
Illini::Illini (string filename,int color1,int color2):Image(filename)
{
for(unsigned x = 0; x < width() ; x++)
for(unsigned y = 0; y < height(); y++)
{
//reference on the pixel
HSLAPixel &P = getPixel(x, y);
if(min(360-abs(P.h-color1),abs(P.h-color1)) > min(360-abs(P.h-color2),abs(P.h-color2))){
P.h =color2;
}else{
P.h =color1;
}
}
}
## Spotlight
A Spotlight image create a spotlight centered at a given point centerX, centerY defined as attributes.
A spotlight adjusts the luminance of a pixel based on the Euclidean distance the pixel is away from the center by decreasing the luminance by 0.5% per 1 pixel, up to 80% derease of luminance at a distance up to 160 pixels away.
Spotlight::Spotlight(string filename,int X,int Y):Image(filename),x(X),y(Y),filename(filename)
{
for(unsigned x = 0; x < width() ; x++){
for(unsigned y = 0; y < height(); y++)
{
//reference on the pixel
HSLAPixel &P = getPixel(x, y);
double distance=sqrt((x-X)*(x-X)+(y-Y)*(y-Y));
double decrease = 1-distance*0.5/100 ;
if (distance>160) {
decrease=0.2;
}
P.l = decrease*P.l;
}
}
}
### Changing the spotlight
Changing the position of the spotlight.
void Spotlight::changeSpotPoint(int centerX, int centerY){
for(unsigned X = 0; X < width() ; X++){
for(unsigned Y = 0; Y < height(); Y++)
{
//reference on the pixel
HSLAPixel &P = getPixel(X, Y);
double distance1=sqrt((x-X)*(x-X)+(y-Y)*(y-Y));
double distance=sqrt((X-centerX)*(X-centerX)+(Y-centerY)*(Y-centerY));
double decrease = 1-distance*0.5/100 ;
double increase = 1-distance1*0.5/100 ;
if (distance1>160) {
increase=0.2;
}
P.l =P.l/increase;
if (distance>160) {
decrease=0.2;
}
P.l = decrease*P.l;
}
}
}