Is there a way to increase the canvas size by a specific amount to pics of different dimensions?

[Ham1000]

Hi,

I have a load of pics of differing sizes that I want to increase in size by 20px all round. Is there an easy way to automate this (ie with an action) or do I need to use a script? It might be worth pointing out that I have very little knowledge of scripting so am hoping that an action will do the job!

Any help would be awesome. Thanks.

[Kukurykus · Accepted solution]

function rC(v) {return eval("aD." + v + ".as('px') + UnitValue('20 px')")}
(aD = activeDocument).resizeCanvas(rC('width'), rC('height'))

[Stephen Marsh]

Thanks kukurykus! You always have such a concise, “non-standard” coding style, similar to r-bin!

[Kukurykus]

r-bin uses hard but understable codes. Mine are just wrote in specific for me style 😉

[Ham1000]

Thanks Kukurykus.

Where do I add that text?

:o/

[Stephen Marsh · Accepted solution]

https://prepression.blogspot.com/2017/11/downloading-and-installing-adobe-scripts.html?m=1

Scripts are installed in the /Presets/Scripts folder

Mac OS Example:

/Applications/Adobe Photoshop CC 2018/Presets/Scripts

Win OS Example:

C:\Program Files\Adobe\Adobe Photoshop CC 2018\Presets\Scripts

Alternatively, select File > Scripts > Browse, and navigate to the script file.

[Ham1000]

Legend! I'll give it a go, thanks.

[Ham1000]

Struggling to get that to work...

:o(

[Stephen Marsh · Accepted solution]

You saved the file as RTF and not plain text.

You just need to record the action using the relative option;

http://www.peachpit.com/articles/article.aspx?p=1660206

[Kukurykus]

Stephen_A_Marsh said everything, so I added his answers to correct ones 😉

[Stephen Marsh]

I’m not in front of a computer, however from memory you should be able to use a relative value to expand the canvas in an action without requiring a script. 

EDIT: Now that I am in front of Photoshop, here is a visual:

Keep in mind that adding a uniform relative 20px is the total size, so that would be 10px on each edge. 

[D Fosse]

That's right. An action, expanding by pixels in Canvas Size, is straightforward. A script is not necessary.

[Ham1000]

Thanks Kukurykus and Stephen_A_Marsh; the script (once I'd managed to make it!!) worked a treat, and I can't believe how many years I've used PhotoShop but never seen the "Relative" tick box in Canvas Size!! Apparently you can teach an old new tricks! LOL

[JJMack]

Just remember every time you play or run a script or play an action like that editing a document the document canvas size will be increased. Actions that add mats and frames to images often use several such steps. And canvas added to a background layer will had some color.

[josephlavine]

I believe the simplest option is to create an Action to increase the Canvas size, and then you can Batch this will multiple files.

[Ham1000]

Thanks Joseph. Yet again, the Adobe Community fixes my problems super fast!!

[Kukurykus]

Script can be automated by Batch too. Simply record it as an regular item.