Converting image format in clipboard

[rayps]

Hello everyone.

I'm making a workflow to convert the copied PNG then paste it as JPG. 

The PNG is mostly just screenshot taken with ⌘⇧⌃4 or copied through the "Copy Image" in the context menu of Chrome/Safari.

My goal is after copied/captured a PNG image, run the workflow in Alfred, then paste it somewhere as JPG, more excatly not pasting it in Finder but in some other software, document editing or Discord ,etc.

I was able to read the clipboard image with {clipboard:0}, but it seems like only getting a text description as in Alfred's clipboard history.

And I also know that I can set clipboard content with "Outputs > Copy to Clipboard", but only the content types of text or rich text are allowed.

If anyone can give me an idea I will be appreciated.

[deanishe]

1 hour ago, rayps said:

I was able to read the clipboard image with {clipboard:0}

 

That only works with text. You can't pass around binary image data in a workflow.

 

If you want to manipulate images on the clipboard, you'll have to do it via Apple's APIs.

[rayps]

Thank you! I managed to get it work today. I'll put the solution here in case Google index this post.

https://gist.github.com/RayPS/5f8c31de2a4ded2f0e947996c30ab1fe

[deanishe]

Glad you figured it out. Is that script right? You're putting the JPEG data on the clipboard as TIFF data.

[rayps]

Yes, somehow it just worked as I expected. It's a little bit confused at the first moment, it's seems like that's how macOS store bitmap data in clipboard.

Because there's no JPEG type in NSPasteboard.PasteboardType 

 

[deanishe]

2 hours ago, rayps said:

it's seems like that's how macOS store bitmap data in clipboard.

 

TIFF's a complicated format. I'm sure it supports JPEG compression, amongst other things.

 

2 hours ago, rayps said:

there's no JPEG type in NSPasteboard.PasteboardType

 

You should be able to use the string public.jpeg