before you jump to post a reply, please take the time to read my thread.
This is not a general discussion for PNG and JPEG, it is for a specific website, etsy.com
more specifically for the banners.
I got into a very serious argument with a fellow seller, which make me to test both PNG and JPEG.
here is my results with my tests:
Terminology: DPI is the quality of an image, the higher the number the better the quality, the standard for
-printing is 300DPI
-web use 72DPI, lower than 72 DPI is BAD IMAGE!
I used an banner 760x100 pixels, 300 dpi, size (2.533x0.333 inches)
and the same image as PNG, I saved both images from the website, this way I will see the image's quality's numbers, I use photoshop which is a professional program for designers, those as the results:
size: 2.536x0.334 inches,
118DPI (it kept the same size as my 300dpi original banner in inches, BUT at a lower resolution, that is lower resolution image)
width : 10.556x1.389
72DPI (it kept the proportions perfect as my original banner, from 300DPI to 72 DPI which it the correct size and resolution)
Then I make a 72DPI image (which is for web use), PNG lossless (it means it was saved with all the data/resolution of my design from the source, which is photoshop) at 760x100 pixels
I uploaded and those are the results when I saved the banner from my shop's webpage:
size: 10.686x1.406 inches
what is this? 28dpi resolution from 72? thats a very bad quality image, Etsy compression system degraded the quality.
But I am confused with the banner I make that was 300 dpi, which resulted at the same size in inches, but at lower resolution. Does this means it degraded the resolution or not? because those numbers showed me that PNG had a loss at the resolution!
or my mind forgot math.
So, because my mind has stopped, is PNG a better choice for a website that either way compress the files like this?
Because at the test and vector art, I see no visible difference to the banner when I have my tab open from the previous image which was JPEG, actually when I upload the image, it has a small noise, same the PNG and JPEG. Absolutely no difference!
Please some tech savvy here to enlighten me a little bit. Again, try to reply according to those results from this specific website.