OpenGL textures look poor

Question

I'm having some issues loading in textures in OpenGL, as my textures keep rendering incorrectly or coming out looking muddy. For instance, here I tried to load a 256x256 color spectrum image. On the left is how it looks in OpenGL and on the right is how it looks in an image viewing program: As you can see, while the left image resembles the right image, the left image appears to squish the blues, and greens, and extend the pinks.

I also tried loading in this 512x512 image of a dog and the result came out like this (again, left is OpenGL, right is image viewer): For this image, the image looks like it has lost a lot of its color, resulting in something that looks white washed and like it came out of a 1970s camera. (the fact that is flipped is fine however since the cube that I am drawing this on has some texture coordinates flipped to accommodate for a different image).

I load in these .BMP textures using SOIL, as such: glEnable(GL_TEXTURE_2D);

GLuint texID = 0;
glGenTextures(1, &texID);

int height = 0, width = 0;
unsigned char* imgData = SOIL_load_image(filePath.c_str(), &width, &height, 0, SOIL_LOAD_AUTO); 

glBindTexture(GL_TEXTURE_2D, texID);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, imgData);
// set texture filtering, gen mip map

Then in my fragment shader I do the following to apply the texture:

#version 330 core
in vec2 TexCoord;

uniform sampler2D textureSampler;

void main() {
    gl_FragColor = texture2D(textureSampler, TexCoord);
}

Answer 1

This has been solved in the comments, but for everyone comming here: I had the same problem that textures appeared washed out on certain (Intel?) GPUs. It turned out that OpenGL had enabled GL_FRAMEBUFFER_SRGB by default on some hardware. Calling glDisable(GL_FRAMEBUFFER_SRGB) right after context creation fixed it for me.