Since I shot many photos in the slot canyons near Page, Arizona (i.e. Antelope Canyon), and since many slot canyons are very dark, but as you shoot up toward the light there are light parts in the photos, there are some adjustments to be made, with regard to the exposure and colors in the photos. Here's a photo that I was experimenting with in Darktable (a free image catalog and adjustment application, which allows me to process the raw files from my 100 MP Fuji medium format digital camera):

Raw Slot Canyon Image File Adjustment in DarktableAs you can see by this image, the dark canyon and bright light from the sky offer too much contrast. Here I was experimenting with various adjustments of a 100 MP raw file from my Fuji GFX100.

As you can see by the screen-capture above, there is a lot of dynamic range in some of my slot canyon photos from Antelope Canyon. In fact, there is more than what was visible, when I was looking up with my own eyes. Therefore I need to adjust at least some of the images - mostly for their exposure, with shadow adjustments and reduction of highlights, but since raw files hold more information than a regular jpeg image, I'm able to adjust saturation and color, in order to make the image look more like what I saw, when I was in the canyon shooting photos.

Here's another example of possible adjustments, showing the differences between two different adjustments. As you can see, the purple and orange hues do appear to be in the raw file, and an image can be adjusted to make it look more yellow, purple, orange, red, or some other color. Believe it or not the walls of the canyons looked very colorful in real life too, but most likely my final images will appear somewhat different than what the reality of the canyons appears to be, when you're there, looking at them with your own two eyes . . . but it does depend what time of day you visit, what time of year, and what your eyes can perceive. Are you a tetrochromat? Are you color blind? I believe I have pretty normal vision, and I adjust my images to my own taste, of course.

Colors Of The Slot CanyonsAs you can see by this comparison of two different versions of an adjusted image, colors can look quite different, and adjustments can bring out various different hues. This is normal, and while it might seem unrealistic, you'd be surprised what the colors really looked like, when I was in the canyon, viewing it with my own eyes. No photo will look exactly as the canyons appear to the human eye, but at different times of day the colors of the canyon walls appear different, so there is a wide range of color visible in the canyons.

The adjustments you see demonstrated here show how much different one raw file can look, depending on color adjustments in a raw file adjustment program like this. Here is my first final version of the photo that I was working with, when I created the screen shots above (as you can see, I didn't choose to use the purple color, because I like the more realistic orange look better):

Antelope Canyon In OrangeThis very orange image of Antelope canyon is much like what I saw. Frankly I can't remember exactly how it looked, so I've taken artistic license when adjusting my images. That's what I almost always do, when adjusting raw files.

Darktable is just one of the many programs I use. Sometimes I use RawTherapee or GIMP, and sometimes I use some other program, such as a basic viewer that allows me to make some adjustments. It all depends on what I'm doing. Most of the software I use today is free. I've spent money in the past on programs like Photoshop and Aperture, and I have experience with Lightroom, Capture One, and other programs too, but I prefer to use open source software for several reasons.

I experimented with adjusting color contrast and white balance, as well as many other parameters (Velvia was one). Here is the result from yet another raw file:

Purple Canyon DSCF2255This Antelope Canyon shot shows the brown, purple, and even pink colors that can be seen after processing images. Some photographers push color toward reds, others toward blue, and this is a mix.

To learn more about Darktable, read about it on Wikipedia here: https://en.wikipedia.org/wiki/Darktable

. . . or watch this YouTube video: https://www.youtube.com/watch?v=rMhe2gYJa9s&t=71s

If you want to download Darktable click here: https://www.darktable.org