EMAN2 uses a unique name to reference each image header attribute. The following table lists the conventions:
| Attribute Name | Data Type | Attribute Description |
|---|---|---|
| apix_x | float | pixel x size in Å |
| apix_y | float | pixel y size in Å |
| apix_z | float | pixel z size in Å |
| nx | int | image x-direction size in number of pixels |
| ny | int | image y-direction size in number of pixels |
| nz | int | image z-direction size in number of pixels |
| origin_row | float | origin location along row (x) in number of pixels |
| origin_col | float | origin location along column (y) in number of pixels |
| origin_sec | float | origin location along section (z) in number of pixels |
| minimum | float | minimum pixel density value in the image |
| maximum | float | maximum pixel density value in the image |
| mean | float | mean pixel density value in the image |
| sigma | float | sigma pixel density value in the image |
| square_sum | float | sum of the squares of each pixel density value in the image |
| mean_nonzero | float | mean pixel density value in the image, ignoring pixel whose value =0. |
| sigma_nonzero | float | sigma pixel density value in the image, ignoring pixel whose value =0. |
| kurtosis | float | kurtosis pixel density value in the image |
| skewness | float | skewness pixel density value in the image |
| orentation_convention | string | Euler orientation Convention, "EMAN", "MRC", etc |
| rot_alt | float | EMAN convention: alt |
| rot_az | float | EMAN convention: az |
| rot_phi | float | EMAN convention: phi |
| datatype | int | pixel data type in the image physical file (e.g., float, int, double, etc). This is an enumeration type. |
| is_complex | int | 1 if this image is a complex image. 0 if it is a real image. |
| is_ri | int | 1 if this is a complex image and is in real/imaginary format; 0 otherwise. |
| avgnimg | int | If the image is the result of averaging, avgnimg is the number of images used in averaging. Otherwise, avgnimg is 0. |
| label | string | user-defined label for this image. It is like 'name' in EMAN1. |
| image_filename | string | the physical image filename where this image comes from. |
| image_index | int | image number in file pointed to by path. |
| DM3.exposure_number | int | DM3 image only. exposure number. |
| DM3.exposure_time | double | DM3 image only. exposure time in seconds. |
| DM3.zoom | double | zoom |
| DM3.antiblooming | int | antiblooming |
| DM3.magnification | double | Indicated magnification |
| DM3.frame_type | string | frame_type |
| DM3.camera_x | int | DM3 image only. camera size along x direction in number of pixels. |
| DM3.camera_y | int | DM3 image only. camera size along y direction in number of pixels. |
| DM3.binning_x | int | DM3 image only. Binning #0 |
| DM3.binning_y | int | DM3 image only. Binning #1 |
| MRC.nlabels | int | MRC image only. Number of comment labels in a MRC image. |
| MRC.labelN | string | MRC image only. The Nth label, where N is an integer from 1 to 10. |
| LST.filenum | int | LIST image only, file number in FileSystem server |
| LST.reffile | string | LIST image only, reference file |
| LST.refn | int | LIST image only, reference image number |
| LST.comment | string | LIST image only, comment |
| micrograph_id | string | Micrograph ID. |
| particle_center_x | float | x coordinate of particle location in the micrograph |
| partcle_center_y | float | y coordinate of particle location in the micrograph |
| ctf_dimension | int | CTF dimension, nD, where n is 1, 2, or 3. |