# Radiometric correction Sequoia

**URL:** <https://community.pix4d.com/t/radiometric-correction-sequoia/2928>\
**Category:** PIX4Dmapper Questions/Troubleshooting\
**Created:** [February 20, 2017, 1:23pm UTC](https://community.pix4d.com/t/radiometric-correction-sequoia/2928 "2017-02-20T13:23:31Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Seb\_Bau](https://avatars.discourse-cdn.com/v4/letter/s/50afbb/32.png) [@Seb\_Bau](https://community.pix4d.com/u/Seb_Bau)\
**Post date:** [February 20, 2017, 1:23pm UTC](https://community.pix4d.com/t/radiometric-correction-sequoia/2928/1 "2017-02-20T13:23:31Z")

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Hello,

In the datasheet of sequoia, they show a blue line (image below). Does it the sensitivity of the sensor?&nbsp;If yes, is there a factor to correct the difference of sensitivity between the spectral bands in pix4d ? Is there also a correction factor related to the tranmsitance of the spectral band pass filter&nbsp;? Does the vignetting is taken into account&nbsp;?

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**Author:** ![Marc\_Desgroseilliers](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/marc_desgroseilliers/32/187_2.png) [@Marc\_Desgroseilliers](https://community.pix4d.com/u/Marc_Desgroseilliers)\
**Post date:** [March 6, 2017, 12:24pm UTC](https://community.pix4d.com/t/radiometric-correction-sequoia/2928/2 "2017-03-06T12:24:25Z")

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Dear Seb,

Indeed, the sensitivity will change from band to band. This is taken into account during the processing of the images. To improve the accuracy of the band sensitivity, we recommend using a radiometric calibration target.&nbsp;

The vignetting coefficients are written in the image EXIF metadata. That means that the original images are not corrected for vignetting, and that the vignetting correction is applied during processing in Pix4D.

Best regards,