The JPEG 2000 format was developed to succeed JPEG. It supports both lossy and lossless compression, and high dynamic range images. GIMP also has a JPEG 2000 codestream exporter, and an exporter for storing a JPEG 2000 image inside a HEIF container.
Compared to JPEG, JPEG 2000 generally has an improved compression in the range of 20%, depending on the image characteristics. Higher-resolution images tend to benefit more.
- ICT compression
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When checked, ICT (Irreversible Color Transform) compression will be used instead of RCT (Reversible Color Transform). ICT can cause rounding errors, which means it is lossy, contrary to RCT.
- Esporta come CMYK
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If you have a CMYK profile assigned to your image as soft-proofing profile, this setting can be checked to have your image exported using that CMYK profile. This is sometimes required when you have your image professionally printed. Your printing company will tell you if this is needed.
If this setting is disabled, you don't have a soft-proofing profile set for this image yet. See assigning a Soft-Proof Profile.
The name of the CMYK profile that is assigned to this image will be shown below this setting.
- Number of resolutions
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Set this to the number of resolutions you want to be stored in your image. This adds reduced size images for faster loading.
- Progression order
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This defines how image data is organized in the JPEG 2000 codestream, allowing you to prioritize progressive viewing by quality, resolution or component. The letters stand for Layer, Resolution, Component, Position.
- LRCP
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The default. Shows quality layers first, then resolution, then components, then spatial positions (good for gradual quality increase).
- RLCP
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Shows all data for the lowest resolution, then adds layers, then moves to the next resolution level.
- PCRL
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Shows full resolution tiles first, then fills in layers, good for fast preview.
- RPCL
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Focuses on spatial detail within a tile first.
- CPRL
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Focuses on full data for one component before moving to the next.
- Compliance profile
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Select the compliance profile you require for your image.
- Standard Profile
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The default conforms to the basic standard functionality for JPEG 2000 images.
- Cinema2K (24 FPS)
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Generates a codestream compliant with the Digital Cinema Specifications for 2K resolution content at 24 FPS.
- Cinema2K (48 FPS)
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Generates a codestream compliant with the Digital Cinema Specifications for 2K resolution content at 48 FPS.
- Cinema4K (24 FPS)
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Generates a codestream compliant with the Digital Cinema Specifications for 4K resolution content at 24 FPS.
- Metadati (modifica)
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You can click the «(edit)» link to open the metadata editor to change or add any metadata that you want to be included in the image. Note: you will also still need to enable the relevant metadata saving options listed below.
The metadata settings in the export dialog override the default values set in your Metadata Export Preferences.
- Salva commento
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Si può leggere questo commento nelle Proprietà dell'immagine.
