# Hugin Reset Values window

Sometimes the optimiser can be fouled by some start values. In this case it can be helpful to go back to a defined start value of the parameters. Sometime you want to reset only selected parameters, e.g. you are satisfied with the geometric optimisation, but the photometric optimiser did not found the optimal result. So you can only reset the photometric parameters and leave the geometric parameters as they are.

If no image on the hugin Camera and Lens tab is selected, resets affects all images. If you select individual images this function is limited to the selected images.

Select the parameters you want to reset: (A more detailed descriptions of the parameters can be found here)

- Image orientations: This will reset yaw, pitch and roll and also the translation parameters to zero. In case the EXIF data of your images contains information about the orientation of the image, these information will be used to reset the roll value to a sensible start value.
- Field of view: In this case hugin tries to calculate the field of view from the information in the EXIF data. If this fails (e.g. not enough information in the EXIF data) the field of view remains unchanged.
- Lens parameters: This options will reset the radial distortion (parameter a, b, c), image center shift (d, e) and image shearing (g, t) to zero.
- Exposure: Here you can select to which value the exposure value should be set (note that when you use this option Hugin will reset the global exposure of the panorama as a whole to the average of all photos):
  - To EXIF values: will reset to the exposure value found in the EXIF data
  - To zero: will reset the exposure value to zero. This means that hugin is not correcting the exposure.
- Color: This will set the red and blue multipliers to 1 corresponding to no white balance change.
- Vignetting: This will reset the parameters for vignetting correction and vignetting center shift to zero (parameters Vb, Vc, Vd, Vx and Vy).
- Camera response curve: Resets the values of the camera response curve to achieve a generic response curve.

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