# How to export RGB image file by multiple single component TIFF image file?
**URL:** https://discourse.vtk.org/t/how-to-export-rgb-image-file-by-multiple-single-component-tiff-image-file/13143
**Category:** Support
**Created:** [January 25, 2024, 3:34am UTC](https://discourse.vtk.org/t/how-to-export-rgb-image-file-by-multiple-single-component-tiff-image-file/13143 "2024-01-25T03:34:31Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@tong\_yang](https://discourse.vtk.org/u/tong_yang)
#### Post date: [January 25, 2024, 3:34am UTC](https://discourse.vtk.org/t/how-to-export-rgb-image-file-by-multiple-single-component-tiff-image-file/13143/1 "2024-01-25T03:34:31Z")
Hello, I have multiple single component TIFF files. I can already export single component TIFF to RGB image files through vtkImageMapToColors.
Now, I want to convert multiple single component TIFF images into RGB image files, and the color mapping for each component is different.
So how can I solve this problem? Thanks a lot.
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### Author:  [@tong\_yang](https://discourse.vtk.org/u/tong_yang)
#### Post date: [February 2, 2024, 2:54am UTC](https://discourse.vtk.org/t/how-to-export-rgb-image-file-by-multiple-single-component-tiff-image-file/13143/2 "2024-02-02T02:54:25Z")
Hello @Timothee_Chabat .
Recently, I have encountered another problem.
Could you please help me take a look.
Thanks a lot.
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### Author:  [@tong\_yang](https://discourse.vtk.org/u/tong_yang)
#### Post date: [March 8, 2024, 5:50am UTC](https://discourse.vtk.org/t/how-to-export-rgb-image-file-by-multiple-single-component-tiff-image-file/13143/3 "2024-03-08T05:50:11Z")
For example, I currently have 4 vtkImageData, each of which is a single component and has a different color mapping. I need to merge these 4 vtkImageDatas into one vtkImageData, as shown in the following figure. I can already display them together through 4 volumes, but I cannot export them into image files such as png and jpg.
