Updating the near native image in DISCO can be accomplished using the Overlay feature. An overlay is a CSV or DAT file that, when applied to a review database via the overlay process in DISCO, can change the metadata, image, OCR text, or native file of a document.
Preparing your image overlay file
- Organize the images you would like to update in the database into a folder. The images must be multi-page PDFs.
- The overlay file must have two fields:
- A unique ID to match the new images to the field in DISCO. You can use either the DISCO Document ID or Instance ID field
- The path to the image files, including the filename.
An example of a .csv overlay file that can update images is below:
Performing the overlay
- In the DISCO main menu, click Overlay.
- Click New Overlay.
- On the Name and description page, enter a name and an optional description for the overlay, and then click Next. The overlay name will be displayed on the card.
- On the File selection page, navigate to and select the overlay file. Ensure that the referenced files are contained in a single folder and that any file paths are relative to the overlay file. Relative paths mean the file paths for referenced files begin with a .\ or with the folder name of the parent folder.
- On this page you can also select the delimiters used between fields in your overlay file. DISCO will pre-populate the delimiters based on the selected overlay file’s extension. These values can be changed by selecting a different value from the dropdown lists or typing in a new one. The three types of delimiters are:
- Field separator - A character separating the columns.
- Field quote - The character used to “quote” or group multiple items together, like a phrase. The field quote is particularly useful when overlaying a custodian in last name, first name format (e.g., “Jones, George”), where the comma is also used as a field separator.
- Multi-value delimiter - A character used to delimit multiple values within a column. In the following example, commas and semicolons are the delimiters:
,“Kinsley, Dave”;”Slovacek, Jerry”,If you do not have a multi-value delimiter, leave the field blank.
DISCO combines the data from duplicate instances into review documents. Some fields are stored on individual instances, while others are stored on the document level. When overlaying, the identifier you select may change the behavior of the overlay. See Overlayable fields for more information.
By default, DISCO will remove redactions from images that are overlaid and note any redactions that are removed in the overlay report. If desired, you can choose to keep redactions on documents when you map to ImagePath. Note that the location of redactions on images is fixed relative to the image size, so if you change the size or aspect ratio of an image via overlay, the redactions may no longer be covering the same information.
To map or change the mapping of the column in your overlay file, click on the corresponding pre-mapped DISCO field or unmapped placeholder. If a matching DISCO field already exists, select it from the dropdown list. If a matching DISCO field does not already exist, you can create a new custom field in the database by typing the name of the new custom field or selecting a custom field name supplied in the overlay file.If the field mapping tool does not properly display your data load-file fields or displays an error message, there is something wrong with your load file’s delimiters. Please ensure your overlay file is a valid text delimited UTF-8 or ANSI text file.