#PDF RESIZER IN KB PDF#
#PDF RESIZER IN KB WINDOWS#

When a camera or cellphone says it takes 10 megapixels photos, it means that each photo has 10 million pixels (mega = million). When an image is large, it may have millions of pixels, and that means storing all information for an image like that in a computer or any device will take millions of bytes. To store each of these pixels, 3 bytes (24 ones or zeros) are generally used. But it is rather obvious: compression of images does not work if the images are downsampled with a document Colour Format of RGB/16.Images are composed by several dots called pixels, and each of them has a color, represented as a combination of three basic colors (red, green and blue). RGB/16: 8219 KB in all three JPEG compression settings (!) But this time I changed the JPEG compression settings during the export: Setting 4) the same image again at DPI of 600, like in Setting 2. RGB/16: 4522 KB -> huge file compared to the other Colour Formats Setting 3) the same image made even smaller with a DPI of 900: RGB/16: 8219 KB -> huge file, even larger than compared to when the image has 300 DPI in the document

#PDF RESIZER IN KB PDF#

Now the image had to be downsampled in the PDF exprort. Setting 2): the same image made smaller on the document, so it had 600 DPI. RGB/16: 6461 KB -> the same size as with other Colour Formats This is the size of the PDF depending on the Colour Format: Then I changed the Option 'Colour Format' in 'Document Setup - Color', and exported a PDF with the preset 'PDF (digital - high quality)'. Setting 1) The image was placed onto the page and the image had 300 DPI - so no downsampling was required. That preset by default downsamples images to 300 DPI, makes JPG with 98% quality and converts image color space, with a setting to Colour Space RGB and ICC profile 'sRGB IEC61966-2.1'. This is what I did: One Image was placed in a document and then exported using the preset 'PDF (digital - high quality)'. I played around and it seems that there is an image compression problem when the 'Document Colour Format' is set to RGB/16 AND the image has to be downsampled to different DPI.

#PDF RESIZER IN KB WINDOWS#

I observed similar problems with large PDF exports and color spaces in Affinity Publisher Windows 1.8.5. of a TIF page) with 'Rasterise: Everything' to force flattening and possibly re-compression. I don't know if your TIF files get treated differently on Affinity export vs. (which you will notice with images of much smaller size.) Instead, if you do not convert on export, than various resource profiles may become embedded additionally to the documents profile and thereby rather increase the file size compared to non-embedded profiles. The color conversion translates color values of pixels, not their compression. I doubt your assumption that color conversion might influence the file size in that way, if all resources are RGB/8. Note that Adobe and Serif apps may apply JPG compression differently (different algorhythms), so even 'same settings' can cause different compression rate and therefore different file size. Just try a page with a lower value to experience a change in PDF file size. I assume you are back with this problem possibly because of a recent change in APub's export presets, which now by default uses 98% compression quality. How on earth is this possible and why Affinity Publisher cannot do this process on its own? The thing is that when I ran both of these files through online PDF Resizer with the setting 'Medium quality (150 dpi images)' I got two files - 5.6MB and 4.6MB - and guess what: I cannot tell the difference! The text looks the same, the pictures look exactly the same.

In both cases the images are compressed to 85% - I don't want to go lower as this document is meant for developer presentation and they need the pictures to really stand up and be of high quality. If I choose PDF (digital - low quality) it results into 40MB file. If I choose PDF (digital - high quality) it results into 50MB file. It has total of 9 images which I've downsampled in advance to smaller sizes at 72dpi. I just created 16-page brochure meant for electronic use - 2200x1500px. I would like to understand the process on export and why the exported PDFs are so big.

Pdf resizer in kb