diff --git a/doc/images/fnirt_displacement_field.png b/doc/images/fnirt_displacement_field.png
index 7b475c76d0b8c5c95275962140475588611f53c6..734f30b5aa97e0c09f1512119daa5c8620b999f9 100644
Binary files a/doc/images/fnirt_displacement_field.png and b/doc/images/fnirt_displacement_field.png differ
diff --git a/doc/images/fnirt_displacement_field.xcf b/doc/images/fnirt_displacement_field.xcf
index ef0158fcee6d8a809e2663eba204d724a7016788..2d1a9cca1b475652801c2344b54ab225c999ab61 100644
Binary files a/doc/images/fnirt_displacement_field.xcf and b/doc/images/fnirt_displacement_field.xcf differ
diff --git a/doc/images/x5_linear_transform_file.png b/doc/images/x5_linear_transform_file.png
index cd47cf1aff2cd57b76054562650dfde752fd4bd0..2992210ad705961e6f9b5d89d0047dd17d9d8280 100644
Binary files a/doc/images/x5_linear_transform_file.png and b/doc/images/x5_linear_transform_file.png differ
diff --git a/doc/images/x5_linear_transform_file.xcf b/doc/images/x5_linear_transform_file.xcf
index 8e940fb6f679e9fff191adcda731735a78404422..7be2987b6797e1843a64b9f1007000cafefeb7f9 100644
Binary files a/doc/images/x5_linear_transform_file.xcf and b/doc/images/x5_linear_transform_file.xcf differ
diff --git a/doc/images/x5_nonlinear_coefficient_field_file.png b/doc/images/x5_nonlinear_coefficient_field_file.png
index 7d5a6dc66b4858020dfb5280f9fcdca69c416b79..08337473ec646e1f1e88037f854e6847e643b417 100644
Binary files a/doc/images/x5_nonlinear_coefficient_field_file.png and b/doc/images/x5_nonlinear_coefficient_field_file.png differ
diff --git a/doc/images/x5_nonlinear_coefficient_field_file.xcf b/doc/images/x5_nonlinear_coefficient_field_file.xcf
index 434863734859e4e30815ef285298d7f13dac82e8..78351fad020f8406dbc400d1fe0b5992b23f7948 100644
Binary files a/doc/images/x5_nonlinear_coefficient_field_file.xcf and b/doc/images/x5_nonlinear_coefficient_field_file.xcf differ