The HEJ2 format is a JPEG 2000 image encoded inside a HEIF container. GIMP also has direct JPEG 2000 export available.
- Lossless
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When checked, the image will be exported with lossless compression. This will create a higher quality image at the cost of a larger file size.
- Quality
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If Lossless is not checked, this value determines the quality of the image compression. 100 provides the best quality image and lowest compression, while 0 provides the highest compression and worst quality image.
- Pixel format
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Defines what pixel format the exported image should use for color sub-sampling. There are three options:
- YUV420
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Suitable for photographs with lossy compression. This format is most compatible with other software that uses HEIF and AVIF.
- YUV444
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When used with a high Quality setting, this format exports a visually lossless image.
- RGB
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Useful when exporting images with true lossless quality.
RGB is not available when exporting as HEJ2.
- Bit depth
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Determines if the pixel data should be stored using 8 bits, 10 bits, or 12 bits per color channel.
- Encoder speed
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The tradeoff between speed and compression. Slow will provide a smaller filesize but takes longer to encode.
- Save color profile
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If checked, the color profile is embedded in the exported image.
- Save Exif
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If checked, the Exif metadata is embedded in the exported image.
- Save XMP
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If checked, the XMP metadata is embedded in the exported image.
