Trying to record w and h in info panel to create auto straighten object script in photoshop.

[dance621126]

I am trying to create a script to auto straighten items in ps cc. (note "crop & straighten" automation works well but not 100%; also note I can achieve this in lightroom but want to keep the process in cc).

The basic question I am asking is how to I record w and h values of selected items in the F8 info panel. I want to compare two h values and then return a command to photoshop to rotate an item based on the result. Is this done with javascript? VB? Where is a good resource to learn how to do this? I know my way around cc but know little about coding andmy coder is not familiar with cc. The explanation for why I am doing this is below...

Items I want to auto straighten are individual artworks on greenscreen background. After removing background I am left with an item which will be usually slightly skewed. To auto straighten the item I need to know the top left and top right information for the item so I can calculate the degree of rotation needed to auto straighten. CC doesnt seem to have an option to give this info. Cntl T doesnt reveal the lower of the two points.

But I have a work around. I use "Image>Canvas size" and remove 95 percent of the left hand side of the image. Then "Image>Trim" to remove any blank space above.

I then undo the canvas size and repeat that process after remopving 95% of the right hand side of the image.

I can then compare the height of the trimmed ( Image>Trim) left and right sides. If left is 30 pixels shorter than the right then I know I have to rotate the left 15 pixels up to straighten the image.

Thanks

[Chuck Uebele]

You can use the dimensions of a layer using "bounds" which will give you an array of the coordinates. The 0 part of the array is the width left side. 2 is the width right side. 1 is height top, and 3 is height bottom. Subtracting these numbers give you the actual dimension. 

var doc = activeDocument
var lay= doc.activeLayer
var layHeight = lay.bounds[3]- lay.bounds[1]

[dance621126]

Unless I misunderstood isnt that essentially drawing a rectangle around the object? It would give the height of the higher side of the skew but not the height of the lower side of the skew?

[dance621126]

Here is my visual representation...

[Chuck Uebele]

Yes, to both your illustrations. If you do as you mentioned by cropping the left and right part's of the layer, you will get a different value for the height of the two sides, which you can then use to calculate the angle for rotation.

[dance621126]

Thanks Chuck for the info. My main question is which language to capture the height info? Is that javascript? I have no experience with coding photoshop. Any good links for an overview of how to proceed? Thanks.

[Chuck Uebele]

Yes, Javascript is used to get the height. I would start with this:

https://www.google.com/url?sa=t&source=web&rct=j&url=https://blog.cutterman.cn/assets/files/photosho...

[dance621126]

Many thanks for your help Chuck !!

[jefbr]

And for the theory behind this operation, you could check out this information:

https://en.wikipedia.org/wiki/Hough_transform