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Multispectral imagery refers to images that are captured using multiple bands of the electromagnetic spectrum, beyond just the visible light spectrum. This means that they capture data across a wider range of wavelengths, from ultraviolet to infrared.
By capturing data across multiple spectral bands, multispectral imagery can provide additional information about the objects or scenes being imaged, such as their composition, temperature, and vegetation health. This information can be used for a wide range of applications, including agriculture, environmental monitoring, disaster response, and military surveillance.
Multispectral imagery is often captured using specialized sensors on satellites, drones, or aircraft. The data is then processed using specialized software to create images that display the information captured in each spectral band.
In essense, multispectral imagery provides a powerful tool for analyzing and understanding the world around us, allowing us to gain insights that would be impossible to obtain using visible light imagery alone.
Multispectral Support in ImageMagick
ImageMagick supports multispectral images where all channels have the same dimensions and number of pixels as the original image. However, not all image formats support multispectral images. PSD, TIFF, MIFF, MPC, and FTXT have full support for multispectral images up to 63 bands with 53 as meta channels.
We call image channels beyond the standard RGB(A) or CMYK(A) channels, "meta" channels. We label them as "meta", "meta1", "meta2", etc.. Meta channels are treated the same as any other channel meaning they can be read, written, and operated upon-- e.g., resized, gamma adjusted, etc..
Create a Multispectral Image
Begin with a multispectral image, typically in the TIFF or PSD format. If you don't have one, you can create your own. In our example, we create a single CMYK pixel with two meta channels. Stuff this in a file titled multiMeta.txt:
Notice the channel depth and statistics associated with the two meta channels.
Working with Multispectral Images
Meta channels are treated the same as any other channel meaning they can be read, written, and operated upon-- e.g., resized, gamma adjusted, etc.. Here, we replace the first channel with the contents of the meta channel:
You can preserve multispectral images by writing them to a format that supports meta channels such as TIFF or PSD. If you write to other image formats that do not support multisprectal images, the channels are not preserved and instead lost-- e.g., PNG. In this example, we read, resize, and write a multispectral image:
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Multispectral imagery refers to images that are captured using multiple bands of the electromagnetic spectrum, beyond just the visible light spectrum. This means that they capture data across a wider range of wavelengths, from ultraviolet to infrared.
By capturing data across multiple spectral bands, multispectral imagery can provide additional information about the objects or scenes being imaged, such as their composition, temperature, and vegetation health. This information can be used for a wide range of applications, including agriculture, environmental monitoring, disaster response, and military surveillance.
Multispectral imagery is often captured using specialized sensors on satellites, drones, or aircraft. The data is then processed using specialized software to create images that display the information captured in each spectral band.
In essense, multispectral imagery provides a powerful tool for analyzing and understanding the world around us, allowing us to gain insights that would be impossible to obtain using visible light imagery alone.
Multispectral Support in ImageMagick
ImageMagick supports multispectral images where all channels have the same dimensions and number of pixels as the original image. However, not all image formats support multispectral images. PSD, TIFF, MIFF, MPC, and FTXT have full support for multispectral images up to 63 bands with 53 as meta channels.
We call image channels beyond the standard RGB(A) or CMYK(A) channels, "meta" channels. We label them as "meta", "meta1", "meta2", etc.. Meta channels are treated the same as any other channel meaning they can be read, written, and operated upon-- e.g., resized, gamma adjusted, etc..
Create a Multispectral Image
Begin with a multispectral image, typically in the TIFF or PSD format. If you don't have one, you can create your own. In our example, we create a single CMYK pixel with two meta channels. Stuff this in a file titled
multiMeta.txt
:Let's convert that to the TIFF image format:
Let confirm that worked as expected:
Notice the channel depth and statistics associated with the two meta channels.
Working with Multispectral Images
Meta channels are treated the same as any other channel meaning they can be read, written, and operated upon-- e.g., resized, gamma adjusted, etc.. Here, we replace the first channel with the contents of the meta channel:
The original cyan channel has an intensity of 10. It's now, per the channel FX instructions, 50.
And in this example, we create two meta channels:
Writing Multispectral Images
You can preserve multispectral images by writing them to a format that supports meta channels such as TIFF or PSD. If you write to other image formats that do not support multisprectal images, the channels are not preserved and instead lost-- e.g., PNG. In this example, we read, resize, and write a multispectral image:
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