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"""
The OpenGL specification doesn't allow you to create a context without a window,
since it needs the pixel format that you set into the device context.
Actually, it is necessary to have a window handler to create a "traditional" rendering context.
It is used to fetch OpenGL information and extensions availability.
Once you got that information, you can destroy the render context and release the "dummy" window.
So, in this code, the window is created, the context is set to this window,
the image result is saved to an output image file and, then, this window is released.
"""
import glfw
from OpenGL.GL import *
import OpenGL.GL.shaders
import numpy
from PIL import Image
import base64
from io import BytesIO
from utils.settings import set_options
def image_enhance(image, exposure, saturation, contrast, brightness, gamma, shadows, highlights, whites, blacks,
clarity, temperature, sharpness):
# Initialize glfw
if not glfw.init():
print('error in init')
return
# Create window
# Size (1, 1) for show nothing in window
window = glfw.create_window(1, 1, "My OpenGL window", None, None)
# window = glfw.create_window(800, 600, "My OpenGL window", None, None)
# Terminate if any issue
if not window:
print('error in window')
glfw.terminate()
return
# Set context to window
glfw.make_context_current(window)
#
# Initial data
# Positions, colors, texture coordinates
'''
# positions colors texture coords
quad = [ -0.5, -0.5, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0,
0.5, -0.5, 0.0, 0.0, 1.0, 0.0, 1.0, 0.0,
0.5, 0.5, 0.0, 0.0, 0.0, 1.0, 1.0, 1.0,
-0.5, 0.5, 0.0, 1.0, 1.0, 1.0, 0.0, 1.0]
'''
# positions colors texture coords
quad = [-1., -1., 0., 0.,
1., -1., 1., 0.,
1., 1., 1., 1.,
-1., 1., 0., 1.]
quad = numpy.array(quad, dtype=numpy.float32)
# Vertices indices order
indices = [0, 1, 2,
2, 3, 0]
indices = numpy.array(indices, dtype=numpy.uint32)
# print(quad.itemsize * len(quad))
# print(indices.itemsize * len(indices))
# print(quad.itemsize * 8)
#
# Vertex shader
vertex_shader = """
attribute vec4 a_position;
attribute vec4 a_color;
attribute vec2 a_texCoord;
varying vec2 v_texCoord;
varying vec4 v_color;
void main() {
gl_Position = a_position;
v_texCoord = a_texCoord;
v_color = vec4(a_color.rgb * a_color.a, a_color.a);
}
"""
# Fragment shader
fragment_shader = """
varying vec2 v_texCoord;
uniform sampler2D u_image;
uniform float u_gamma;
uniform float u_shadows;
uniform float u_highlights;
uniform float u_whites;
uniform float u_blacks;
uniform float u_clarity;
uniform mat4 u_colorMatrix;
uniform vec4 u_colorOffset;
uniform vec2 u_pixelDimension;
uniform mat4 u_clarityMatrix;
uniform vec4 u_clarityOffset;
uniform float u_temperature;
uniform float u_sharpness;
const vec3 warmFilter = vec3(0.93, 0.54, 0.0);
const mat3 RGBtoYIQ = mat3(0.299, 0.587, 0.114, 0.596, -0.274, -0.322, 0.212, -0.523, 0.311);
const mat3 YIQtoRGB = mat3(1.0, 0.956, 0.621, 1.0, -0.272, -0.647, 1.0, -1.105, 1.702);
const float EPSILON = 0.0000001;
vec4 unpremultiply(vec4 col) {
col.rgb /= max(col.a, EPSILON);
return col;
}
float calculateLuminance(vec3 rgb) {
// This is the luminance calculation part of the RGB to HSL formular.
vec4 p = mix(
vec4(rgb.gb, 0.0, -1.0 / 3.0),
vec4(rgb.bg, -1.0, 2.0 / 3.0),
vec4(rgb.g < rgb.b)
);
vec4 q = mix(
vec4(rgb.r, p.yzx),
vec4(p.xyw, rgb.r),
vec4(rgb.r < p.x)
);
float croma = q.x - min(q.w, q.y);
float luminance = q.x - croma * 0.5;
return luminance;
}
vec3 map(vec3 x, float in_min, float in_max, float out_min, float out_max){
return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
}
void main() {
vec4 color = clamp(texture2D(u_image, v_texCoord), 0.0, 1.0);
color.rgb /= max(color.a, EPSILON); // Revert premultiplied alpha
// Apply gamma
if (u_gamma != 1.0) {
color.rgb = pow(color.rgb, vec3(1.0 / max(u_gamma, EPSILON)));
}
// Apply shadows and highlights
float luminance = calculateLuminance(color.rgb);
float shadow = u_shadows >= 0.0
? clamp(
pow(luminance, 1.0 / (u_shadows + 1.0))
+ pow(luminance, 2.0 / (u_shadows + 1.0)) * -0.76
- luminance
, 0.0, max(u_shadows, 1.0))
: -clamp(
pow(luminance, 1.0 / (-u_shadows + 1.0))
+ pow(luminance, 2.0 / (-u_shadows + 1.0)) * -0.76
- luminance
, 0.0, max(-u_shadows, 1.0));
float highlight = u_highlights < 0.0
? clamp(
1.0
- pow(1.0 - luminance, 1.0 / (1.0 - u_highlights))
- pow(1.0 - luminance, 2.0 / (1.0 - u_highlights)) * -0.8
- luminance
, -1.0, 0.0)
: -clamp(
1.0
- pow(1.0 - luminance, 1.0 / (1.0 + u_highlights))
- pow(1.0 - luminance, 2.0 / (1.0 + u_highlights)) * -0.8
- luminance
, -1.0, 0.0);
// Bright color need more contrast and dark color need more brightness.
// This is to keep saturatation because the color information of a dark colors is lost.
float shadowContrast = shadow * luminance * luminance;
float shadowBrightness = shadow - shadowContrast;
float offset = luminance + shadowContrast + highlight;
color.rgb = clamp(offset * ((color.rgb + shadowBrightness) / max(luminance, EPSILON)), 0.0, 1.0);
// Apply Color Matrix
color.rgb = clamp(color * u_colorMatrix + u_colorOffset, 0.0, 1.0).rgb;
color.rgb = map(color.rgb, 0.0, 1.0, u_blacks / 2.0, 1.0 + u_whites / 2.0);
color = clamp(color, 0.0, 1.0);
color.rgb *= color.a; // Reset premultiplied alpha
if (u_clarity != 0.0) {
color = unpremultiply(color);
// L = Left, R = Right, C = Center, T = Top, B = Bottom
vec4 colLB = texture2D(u_image, v_texCoord + vec2(-u_pixelDimension.x, -u_pixelDimension.y));
vec4 colLC = texture2D(u_image, v_texCoord + vec2(-u_pixelDimension.x, 0.0));
vec4 colLT = texture2D(u_image, v_texCoord + vec2(-u_pixelDimension.x, u_pixelDimension.y));
vec4 colCL = texture2D(u_image, v_texCoord + vec2( 0.0, -u_pixelDimension.y));
vec4 colCR = texture2D(u_image, v_texCoord + vec2( 0.0, u_pixelDimension.y));
vec4 colRB = texture2D(u_image, v_texCoord + vec2( u_pixelDimension.x, -u_pixelDimension.y));
vec4 colRC = texture2D(u_image, v_texCoord + vec2( u_pixelDimension.x, 0.0));
vec4 colRT = texture2D(u_image, v_texCoord + vec2( u_pixelDimension.x, u_pixelDimension.y));
vec4 mergedColor = color;
mergedColor.rgb += unpremultiply(colLB).rgb + unpremultiply(colLC).rgb + unpremultiply(colLT).rgb;
mergedColor.rgb += unpremultiply(colCL).rgb + unpremultiply(colCR).rgb;
mergedColor.rgb += unpremultiply(colRB).rgb + unpremultiply(colRC).rgb + unpremultiply(colRT).rgb;
mergedColor /= 9.0;
float grayValue = clamp(color.r * 0.3 + color.g * 0.59 + color.b * 0.1, 0.111111, 0.999999);
// 1.0 and 0.0 result in white not black, therefore we clamp
// Here we create a function that will map values below 0.1 to 0. Values above 0.2 will be mapped to 1,
// and for values between 0.1 and 0.2 it will produce a gradient.
// The funtion is mirror at 0.5, meaning values between 0.8 and 0.9 will result in a decending gradient.
// And values above 0.9 will be mapped to 0.
float frequenceFactor = min(smoothstep(1.0 - grayValue, 0.0, 0.11), smoothstep(grayValue, 0.0, 0.11));
// here we apply the high pass filter. Its strength is determined by the uniform ,
// and the frequence factor. That means the only the mid tones are affected by this filter.
// Clarity input is ranging from -1 to 1. But we want to strengthen the effect.
// Therefore we see this little magic number '3.7'.
color.rgb = clamp(color + clamp((color - mergedColor) * u_clarity * 3.7 * frequenceFactor, 0.0, 10.0), 0.0, 1.0).rgb;
// apply exposure but only to the mid tones.
color.rgb = color.rgb * pow(2.0, u_clarity * 0.27 * frequenceFactor);
// apply contrast and desaturation matrix
color.rgb = clamp(color * u_colorMatrix + u_colorOffset, 0.0, 1.0).rgb;
color.rgb *= color.a; // Premultiply alpha
color = clamp(color, 0.0, 1.0);
}
if(u_temperature != 0.0){
float temperature = u_temperature;
const float tint = 0.0;
vec4 source = color;
source.rgb /= max(source.a, EPSILON); // Revert premultiplied alpha
vec3 yiq = RGBtoYIQ * source.rgb;
yiq.b = clamp(yiq.b + tint*0.5226*0.1, -0.5226, 0.5226);
vec3 rgb = YIQtoRGB * yiq;
vec3 processed = mix(
(1.0 - 2.0 * (1.0 - rgb) * (1.0 - warmFilter)),
(2.0 * rgb * warmFilter),
vec3(rgb.r < 0.5, rgb.g < 0.5, rgb.b < 0.5)
);
color = vec4(mix(rgb, processed, temperature), source.a);
color.rgb *= color.a; // Premultiply alpha again
}
if (u_sharpness != 0.0){
float factor = mix(0.2, -1.0, float(u_sharpness > 0.0));
vec4 sharpenedColor = mix(0.2, 5.0, float(u_sharpness > 0.0)) * color;
sharpenedColor += factor * clamp(texture2D(u_image, v_texCoord + u_pixelDimension * vec2(-1.0, 0.0)), 0.0, 1.0);
sharpenedColor += factor * clamp(texture2D(u_image, v_texCoord + u_pixelDimension * vec2( 0.0, -1.0)), 0.0, 1.0);
sharpenedColor += factor * clamp(texture2D(u_image, v_texCoord + u_pixelDimension * vec2( 0.0, 1.0)), 0.0, 1.0);
sharpenedColor += factor * clamp(texture2D(u_image, v_texCoord + u_pixelDimension * vec2( 1.0, 0.0)), 0.0, 1.0);
color.rgb /= max(color.a, EPSILON); // unpremultiply
sharpenedColor.rgb /= max(sharpenedColor.a, EPSILON); // unpremultiply
sharpenedColor = clamp(sharpenedColor, 0.0, 1.0);
color = clamp(mix(color, sharpenedColor, abs(u_sharpness)), 0.0, 1.0);
color = vec4(color.rgb * color.a, color.a); // premultiply
}
gl_FragColor = color;
}
"""
#
# Compile shaders
shader = OpenGL.GL.shaders.compileProgram(OpenGL.GL.shaders.compileShader(vertex_shader, GL_VERTEX_SHADER),
OpenGL.GL.shaders.compileShader(fragment_shader, GL_FRAGMENT_SHADER))
# VBO
v_b_o = glGenBuffers(1)
glBindBuffer(GL_ARRAY_BUFFER, v_b_o)
glBufferData(GL_ARRAY_BUFFER, quad.itemsize *
len(quad), quad, GL_STATIC_DRAW)
# EBO
e_b_o = glGenBuffers(1)
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, e_b_o)
glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices.itemsize *
len(indices), indices, GL_STATIC_DRAW)
# Configure positions of initial data
# Configure positions of initial data
glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 4 *
sizeof(GLfloat), ctypes.c_void_p(0))
glEnableVertexAttribArray(0)
# Configure texture coordinates of initial data
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 4 *
sizeof(GLfloat), ctypes.c_void_p(8))
glEnableVertexAttribArray(1)
# Texture
texture = glGenTextures(1)
# Bind texture
glBindTexture(GL_TEXTURE_2D, texture)
# Texture wrapping params
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE)
# Texture filtering params
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST)
#
# Open image
#
# img_data = numpy.array(list(image.getdata()), numpy.uint8)
#
# flipped_image = image.transpose(Image.FLIP_TOP_BOTTOM)
# img_data = flipped_image.convert("RGBA").tobytes()
#
img_data = image.convert("RGBA").tobytes()
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, image.width,
image.height, 0, GL_RGBA, GL_UNSIGNED_BYTE, img_data)
# print(image.width, image.height)
#
# Create render buffer with size (image.width x image.height)
rb_obj = glGenRenderbuffers(1)
glBindRenderbuffer(GL_RENDERBUFFER, rb_obj)
glRenderbufferStorage(GL_RENDERBUFFER, GL_RGBA, image.width, image.height)
# Create frame buffer
fb_obj = glGenFramebuffers(1)
glBindFramebuffer(GL_FRAMEBUFFER, fb_obj)
glFramebufferRenderbuffer(
GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, rb_obj)
# Check frame buffer (that simple buffer should not be an issue)
status = glCheckFramebufferStatus(GL_FRAMEBUFFER)
if status != GL_FRAMEBUFFER_COMPLETE:
print("incomplete framebuffer object")
#
# Install program
glUseProgram(shader)
set_options(exposure, saturation, contrast, brightness, gamma, shadows, highlights, whites, blacks,
clarity, temperature, sharpness, shader, image.width, image.height)
# Bind framebuffer and set viewport size
glBindFramebuffer(GL_FRAMEBUFFER, fb_obj)
glViewport(0, 0, image.width, image.height)
# Draw the quad which covers the entire viewport
glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, None)
#
# PNG
# Read the data and create the image
image_buffer = glReadPixels(
0, 0, image.width, image.height, GL_RGBA, GL_UNSIGNED_BYTE)
image_out = numpy.frombuffer(image_buffer, dtype=numpy.uint8)
image_out = image_out.reshape(image.height, image.width, 4)
glfw.terminate()
img = Image.fromarray(image_out, 'RGB')
buffered = BytesIO()
img.save(buffered, format="PNG")
img_str = base64.b64encode(buffered.getvalue())
return img_str
if __name__ == "__main__":
image = Image.open("/Users/planningo/Downloads/download.jpeg")
image_enhance(image, exposure=0, saturation=0, contrast=0, brightness=0, gamma=1, shadows=0,
highlights=0, blacks=0, whites=0, clarity=0, temperature=-1, sharpness=1)
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