Que campos nos arquivos exif fornecem informações de altura / largura da imagem?
Aqui estão as tags Exif relevantes, conforme definido no padrão Exif 2.3 (PDF Link):
+------------+------------+--------+-------------------------+-------+------------------------------------------------------------------------------------------------------------------------------------------------+
| Tag (hex) | Tag (dec) | IFD | Key | Type | Tag description |
+------------+------------+--------+-------------------------+-------+------------------------------------------------------------------------------------------------------------------------------------------------+
| 0x0100 | 256 | Image | Exif.Image.ImageWidth | Long | The number of columns of image data, equal to the number of pixels per row. In JPEG compressed data a JPEG marker is used instead of this tag. |
| 0x0101 | 257 | Image | Exif.Image.ImageLength | Long | The number of rows of image data. In JPEG compressed data a JPEG marker is used instead of this tag. |
+------------+------------+--------+-------------------------+-------+------------------------------------------------------------------------------------------------------------------------------------------------+
Fonte Tags Exif padrão