User:Ronhjones/PDFreduce

Idiot's guide to reducing the size of an image for non free PDF files.

Ideally this is for single page PDFs. Need to have PDF editor (Acrobat, NuancePDF, etc.) and Photoshop or similar able to reduce TIFF

Use the guideline at WP:Image resolution to work out the new size - height is hhh, width is www.
Work out the reduction factor = old width/new width
Download the PDF file
With a PDF editor save as TIFF
Open TIFF with Photoshop and reduce by the factor chosen (often the photoshop size will not be the same as the PDF size - hence the need to calculate the factor.)
Save TIFF
In Explorer - right mouse and "convert to PDF"
Upload as new version
Edit and change {{non-free reduce}} to {{subst:orfurrev}}

Finished.

Example

Wiki size 587 x 316

Guideline is 431 x 232

Factor is 1.3619

Photoshop shows TIFF as 1175 x 634

Reduced to 862 x 465

Uploaded results in 431 × 233

references