ExportOptionsJPEG computation and simulation

[maria hannad92609693]

Hi,

Given this parameters:

var exportOptions = new ExportOptionsJPEG();
exportOptions.antiAliasing = true;
exportOptions.horizontalScale = 500;
exportOptions.verticalScale = 500;
exportOptions.qualitySetting = 100;

How did it come up with this properties(see dimensions and resolution properties)?

May I know the computation for this?

Also when exporting JPEG in illustrator, the UI show this:

How can I simulate those values using the scripting way(ExportOptionsJPEG)

[Doug A Roberts]

horizontal/verticalScale is a percentage (e.g. 500% in that instance).

qualitySetting is the compression level (100 = no/minimum compression).

What are the dimensions of the original file?

[maria hannad92609693]

See attached for the exact AI file.

This is the image generated using Export as JPEG via illustrator UI

This is the image generated using ExportOptionsJPEG via scripting

[maria hannad92609693]

Here the details of exported image via Illustrator UI

 

[Doug A Roberts]

Your first post shows different settings (72 PPI and CMYK ve 300 PPI RGB). Which do you want to achieve?

There is no PPI setting in ExportOptionsJPEG. Do you want a particular pixel size or a particular real-world size (inches or cm)?

[maria hannad92609693]

It's 300 PPI RGB.

I just wanted to know how to simulate the export JPEG in illustrator UI on ExportOptionsJPEG script.

For example: on export UI I selected this options: 300 PPI RGB and then it produces an image with 1613x2682 dimension and 300x300 dpi. What values(vertical/horizontal scale) should I added to ExportOptionsJPEG script to produce the same image?

[Doug A Roberts · Accepted solution]

That would suggest you are exporting from a 387 x 644 px document in Illustrator?

As I said, there is no PPI setting in ExportOptionsJPEG.

If you want a 1613x2682 px file, I suggest you create an artboard that size and use horizontal/verticalScale of 100.

Provision for applying PPI appears to have been introduced with the Export for Screens options. See here for some discussion, especially Carlos's post:

https://community.adobe.com/t5/illustrator-discussions/export-jpg-as-300-ppi/m-p/11244200

[Test Screen Name]

You did nothing to set ppi in your code. It is not calculated from your unrelated options. It is not set at all. 96 is a default shown by some viewers; others show a default of 72. 

[maria hannad92609693]

Hi,

I'm just following the guide here: https://ai-scripting.docsforadobe.dev/jsobjref/ExportOptionsJPEG.html

How do I set the PPI here?