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About RGB CMYK Image Checker – Inspect Color Space & Channels

Determine the exact color space and channel structure of your raster image files by directly inspecting binary container headers.

Standard browser previews convert all images to RGB canvas pixels; this tool audits native JPEG SOF markers, Adobe APP14 transforms, PNG color types, TIFF photometric interpretations, and WebP bitstream headers locally.

How the calculation works

JPEG SOF Marker Channel Count

1 component = Grayscale; 3 components = YCbCr / RGB; 4 components = CMYK or YCCK

Adobe APP14 Color Transform

Transform 0 = CMYK (untransformed); Transform 2 = YCCK (inverted CMYK)

PNG IHDR Color Type

0 = Grayscale, 2 = RGB, 3 = Palette/Indexed, 4 = Grayscale+Alpha, 6 = RGBA

TIFF PhotometricInterpretation

1 = BlackIsZero (Grayscale), 2 = RGB, 5 = CMYK, 6 = YCbCr

How to use this tool

1Select a JPEG, PNG, TIFF, WebP, or GIF image from your local drive.
2View the detected native color space (RGB, CMYK, Grayscale, or Indexed) and component channel count.
3Inspect raw header metadata including bit depth per channel, Adobe APP14 markers, and embedded ICC profile declarations.
4Verify commercial print compliance before sending photographic files to prepress.

Understanding the result

Images designated CMYK or YCCK are formatted for four-color commercial press printing and will not display accurately on unmanaged RGB displays.

Browser <canvas> elements automatically convert CMYK data to RGB upon rendering; checking the binary file header is the only reliable way to verify true CMYK encoding in the browser.

PNG images cannot natively store CMYK data under W3C specifications and are always Grayscale, Indexed, or RGB.

Important limitations

This tool audits file container headers and metadata structures; it does not decode or re-render pixel color values or apply ICC color management profiles.
Non-standard, corrupted, or heavily encrypted image headers may not disclose color channel definitions.

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Image Size and Quality

Frequently asked questions

Why can’t I just view the image in my web browser to check if it is CMYK?

Web browsers automatically convert CMYK images to sRGB for display, masking the original file format. This tool inspects the binary file headers directly to reveal the true container color space.

Can PNG files be CMYK?

No. The W3C PNG specification does not support the CMYK color model. PNGs are strictly Grayscale, Palette-indexed, or RGB(A).

What is the Adobe APP14 transform in CMYK JPEGs?

APP14 indicates how color channels were encoded. Transform 0 means uncompressed direct CMYK, while Transform 2 indicates YCCK color transformation commonly used by Adobe Photoshop.

Is my image uploaded to an external server?

No. The header inspection runs 100% locally in your browser memory.