For additional help, Google action wish to perform. Below are a small selection of typical edits

Note: In recent versions you have to add magick before convert e.g. magick convert

“squareness” or How to straighten out a page image using the ruler tool

1. Open image in Photoshop

2. Image>Analysis>Ruler tool>

3. Drag mouse along straight edge in the picture

4. Image>Image rotation>arbitrary

5. Press ok

6. Image will appear “straighten out”. Crop as needed. [white or null space may appear around adjusted image. Tip: have sufficient border space in original scan to allow for this adjustment]

Batch auto crop and straighten

• File>automate>crop and straighten Photos - best used when wish to split  multiple images from single file
• PS Script - best used when have large number of image files that you wish to remove background and straighten.  Good to use when images are not a standard size or location on canvas.
• see customized PS script for TIFF formats (on server)
• See script for JPEG formats here: https://forums.adobe.com/thread/290194?start=0&tstart=0
• and here https://forums.adobe.com/thread/993150?start=0&tstart=0 

Manually or precisely rotate images 

helpful when merging images

1. Select what you want to transform, using the  rectangular marquee tool

2. Choose Edit > Transform > Rotate

3. Handles will appear (ie. corners of your selection will become circles). go just outside of the object until you see a curved arrow rotate icon. click to rotate. At this point, simply drag left or right to rotate the selected object. You can also move the object in place by clicking in the middle of the object, or with the directional keyboard arrows
4. Must finish applying the transformation by pressing Enter.

Minor focus adjustments or How to sharpen an image

1. Open image in Photoshop

2. Filter>Sharpen>Unsharp mask

3. Select preview option

4. Adjust settings for desired results as seen in preview window

• Amount: 150% - 300%

• Radius : 0.4

• Threshold : 0

5. Press ok

Merge/Combine images

Photoshop, see How to stitch photos together in Photoshop

ImageMagick (IM)

example command: convert +append img1.gif img2.gif img3.gif  combined.gif

• use -append (top down) or +append (left to right). -append stacks images, edge to edge, from top to bottom. making  one tall image.
• IM commands are case sensitive 

see more at spack.org/wiki:ImageMagickHints

TIP: output filename list to .bat file (DIR /b>out.bat).  Open .bat file in NotePad and remove line breaks, add "convert" to beginning and add name for new merged image at end. Run *.bat file.

Note!: Windows 10 upgrade requires "magick convert" instead of just "convert" (source)

Assign color profile - Not recommended

1. Open image in Photoshop

2. Edit> Assign profile ..

3. Select "profile" option and choose "Adobe RGB (1998)" from drop down list

4. Press Ok

Batch assign color profiles - Not recommended

Part I: Create action

1. Open image in Photoshop

2. Window > Actions

3. On Actions panel, select button: create new action

4. Give name in popup box (eg “assignProfile”)

5. Follow steps for manually assigning profiles (see above)

6. On Actions panel, select button: stop action

Part II: Run batch from Photoshop

1. File>automat>batch

2. Under Play/Action section, press the drop down arrow and select “assignProfile”

3. Under Source section, select "folder" option

4. Press “Choose…” button and navigate to folder containing files wish to edit

5. Select “Suppress File Open Options Dialogs”

6. Select “Suppress Color Profile Warnings “

7. Under Destination section, select “Save and Close”

8. Press ok

Part III: Run batch from Bridge

1. Tools>Photoshop>Batch

2. This will launch Photoshop and open the Batch feature

3. In the Batch window, use same settings as above, except for Source

4. Under Source section, select "Bridge" option (this assumes the folder containing files you wish to modify is already open in Bridge).

Embed copyright information

• batch process script Embedded Image Metadata

Photoshop

1.    Open image in Photoshop

2.    Select File > File info

3.    Goto "Description" tab,

4.    For “Copyright Status” select “Public Domain”

5.    For “Copyright notice”, enter the text: Published by Rice University at scholarship.rice.edu. This work is licensed under a Creative Commons Attribution 3.0 Unported license.

6.      For “Copyright Info URL” use this link: http://creativecommons.org/licenses/by/3.0/

7.    Press OK

Bridge

1.    Select image

2.    In metadata panel, go to IPTC core section

3.    For “Copyright Status” select “Public Domain”

4.    For “Copyright Notice”, enter text: Published by Rice University at scholarship.rice.edu. This work is licensed under a Creative Commons Attribution 3.0 Unported license. : http://creativecommons.org/licenses/by/3.0/

5.    Press Apply