Move away from your monitor and squint your eyes. In the following test strip, the numbers 2.2 should almost disappear, meaning that you monitor is correctly calibrated to a Gamma value of 2.2. Careful: You will get different results in very light or very dark environments.
Another test: In the following strip the first two and the last two rectangles tend to blend into each other. If you actually see a difference, your monitor has perfect Gamma calibration.
Color depth and tone
Calibrating the color of your monitor with your eyes only is not possible. There are plenty of webpages on the internet, where you can download color charts and compare them to printed paper strips from KODAK or likewise. There are usually two types of color charts: RGB for monitors, beamers, websites, presentations and films, and CMYK for print products. You may also downlad Adobe Gamma, a tool which allows for some basic software-based calibration. If you're an image editing professional, you should buy a hardware-based monitor calibration tool.
If you have a good personal printer, and are generally satisfied with the printed results, you can also print out a photo (preferably showing human skin) or a color chart, hold it next to your monitor and adjust the colors until they match the printout. Make sure your monitor is in high color or 24-bit mode (Windows monitor & graphic properties), the room is dimmed, but not too dark, and there are no reflections on the monitor.
Never edit your images without a backup! (see Automatic Backup Option)
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CodedColor PhotoStudio by 1STEIN is an award-winning Windows photo viewer and editor to organize, edit, resize, reformat, correct, compare, sort, watermark, annotate and print digital images, and to edit EXIF and IPTC data in digital photos. You can rename multiple images, remove scratches, stich panoramas, convert RAW photos (from Canon, Nikon, Olympus, etc. cameras), burn digital watermarks, correct colors, batch convert and correct images and generate a web album in HTML5. The software is easier to use than Photoshop, but more versatile than ACDSee, Picasa, Irfanview or Gimp. Many magazines consider it to be the Swiss Knife of Image Editing. Have a look at our Before / After tutorials to get an idea of the powerful capabilities. The software comes with a detailed handbook and a fast database to store EXIF/IPTC data and color information. CodedColor PhotoStudio is the ideal image editing tool for every-day and professional digital camera users. The user friendly interface combines features like expert photo editing & printing, layer editing, web album galleries, slide shows, photo management & cataloging, custom sorting, IPTC & EXIF editor, GPS tagging, perspective correction, barrel distortion, effects, thumbnail generation, resize & resample images, batch conversion, database keyword searching, red eye removal, color/sharpness/brightness & contrast correction, artifact removal, clone brush, scanner & TWAIN import, screen capture, lossless JPEG rotation, transparency (alpha channel) and layers, gamma correction, screen shows with many transition effects, watermark text, image annotations, panorama stitch & animation, video capture, PDF album export, photo layouts, collages, frames, shadows, histograms, automatic white balance, photo sharing, etc. Opens and converts all common image formats: BMP, WMF, GIF, JPEG, JPEG2000, TIFF, PCX, PNG, PSP, PSD, PCD, HEIC, HEIF, AVIF and all current RAW formats. The installation includes our the CodedColor Publisher, a versatile photo layout and DTP tool to create individual and rich photo books.