Image color tools

Color tools adjust the channels inside each pixel. Grayscale and the black-and-white threshold reduce an image to shades of gray or to pure black and white, sepia and tint shift the whole image toward one color, invert flips every channel, and hue rotation moves colors around the wheel while keeping their brightness and saturation. Gamma correction and brightness-contrast work differently: gamma changes the midtones, brightness adds or subtracts across the whole range.

Color models matter when an image has to match something else. The conversion tools show the same pixels expressed as HSL, HSV, HSI, CMYK, YCbCr or Lab values, which is how you read what a color is in the system a printer, a designer or a developer will ask about. Extract Channel pulls one channel out on its own, and swap channels exchanges two - useful when a file's channels are in an unexpected order.

Reducing the number of colors is a separate job from changing them. Quantize maps the image onto a limited palette, dithering adds noise to fake intermediate shades with fewer colors, and a custom palette lets you choose exactly which colors survive. Fewer colors means a smaller file in an indexed PNG, and it is also how you make an image look deliberately retro.

Tools in this category

Two colors PNG Recolors the image into two chosen colors by luminance threshold. 01 Gamma correction PNG Corrects midtone brightness. <1 darker, >1 lighter, 1 — unchanged. 02 Temperature PNG Positive values make the image warmer (more orange), negative ones cooler (more blue). 03 Tint PNG Multiplies color channels by the chosen tint with the given strength. 04 Quantize PNG Reduces the image to k colors via median-cut palette. Transparent pixels are preserved. 05 Custom palette PNG Maps every pixel to the nearest color from your comma-separated hex list. 06 Dithering PNG Applies Floyd–Steinberg error diffusion or ordered Bayer dithering while reducing to k colors. 07 Convert PNG to grayscale Converts the image to shades of gray using the BT.601 luminance formula. Alpha is preserved. 08 Invert PNG colors Inverts each color channel (255 − value). Alpha is unchanged. 09 Brightness & contrast PNG Adjusts brightness and contrast in the range from −100 to +100. Zero means no change. 10 Change PNG opacity Multiplies the alpha channel by a percentage: 0% — fully transparent, 100% — unchanged. 11 Sepia effect Tints the image into the warm brown tones of classic sepia. 12 Change hue PNG Shifts the hue around the circle. Saturation and lightness are preserved. 13 Extract channel PNG Keeps only the chosen channel — red, green or blue — as shades of gray. 14 Swap channels PNG Swaps two color channels — a quick way to get unusual coloring. 15 Black & white threshold PNG Hard binarization by luminance: every pixel becomes black or white. 16 Posterize PNG Reduces the number of levels per channel — a poster effect. 17 Auto contrast PNG Stretches each channel's range across the full available brightness range. 18 Decrease Color Count PNG Median-cut engine as a quick way to drop to 2–256 colors. Presets marked (extreme/strong/balanced/light) match the classic compression levels. 19 Split PNG into HSL Decomposes the image into Hue, Saturation and Lightness components. 20 Split PNG into HSV Decomposes the image into Hue, Saturation and Value (brightness) components. 21 Split PNG into HSI Decomposes the image into Hue, Saturation and Intensity components. 22 Convert PNG to CMYK Colors Decomposes the image into print-style Cyan, Magenta, Yellow and Key (black) components. 23 Convert PNG to YCbCr Colors Decomposes the image into Luma (Y) and Blue-difference / Red-difference chroma components. 24 Convert PNG to LAB Colors Decomposes the image into perceptual Lightness and green–magenta / blue–yellow opponents. 25