[The quality of the image changes]

22 minutes ago, Medical Officer Bones said:

This might be caused by various things.

1) your browser adapted the zoom level to something other than 100%. Modern browsers are screen resolution "aware" and may zoom in a bit, resulting in somewhat blurry looking images. Check the browser zoom level.

2) when uploading an image to most (all?) social media sites, instagram, and many forums the image is processed and optimized once again. This will lead to image quality loss. To mitigate this somewhat, always upload a PNG file (you don't want to make things worse by reprocessing a jpg with compression artefacts), and the size you upload it at also impacts the overall compression quality. Upload an image that is identical or as close as possible to the final actual resolution used by twitter/facebook, etc., and scale down you images to the required size with a good downscale algorithm, such as Catmull-rom or Mitchell. Sharpen the result a bit before uploading. But that's really all you have control over.

3) the image is uploaded at a lower resolution and upscaled with CSS: obviously this will result in a softer image.

https://photography.tutsplus.com/tutorials/twitter-jpeg-compression-how-to-create-the-best-quality-image-for-your-feed--cms-23151

In a nutshell: don't expect the same quality as the original. You have relatively little control over how your images are mauled through, for example, Twitter's and Facebook's (and other sites) image processing servers. It is in their interest to keep the bandwidth as low as possible, and costs down. Which means a lot of lossy compression is used to force small-sized images, which in turn destroys the overall quality of your images.

The one way to prevent this from happening is to serve your images on your own server (or a dedicated image hosting service that does not reprocess your images), and use a forum img code that links to your externally served version. I found that hosting images on your own server works best: you retain full control.

Unfortunately, most social media sites will not allow for this, and want to take full control over your images: externally linking to an image is mostly not allowed or possible.

But the thing is that I save the same image, for example, the already posted original image looks different on AP. I used different ways to upload the image by using websites to upload the image. I also just used a different browser to see the result and it is still poor.

 

Could you please save the image that I posted and open it on AP and tell me if it looks different?

[The quality of the image changes]

4 minutes ago, walt.farrell said:

Where are you posting it? That may determine how it will look.

For example, when you post an image to this forum the software may display a kind of down-sampled version of the image, rather than the higher resolution one you may have uploaded.

On different forums including this one and a sports forum. I also uploaded the image on Twitter and opened it in a new tap "open image in new tab" and I still get the same poor quality.

[The quality of the image changes]

I am sorry to bother, but I do really need some help.

[The quality of the image changes]

Hello.

I was wondering if anyone can help me, please. The quality of the image appears sharper and a bit detailed when I open it on Affinity Photo. I thought it was because of the zoom, but I measure it and the zoom is set on the original zoom/ size 200%

 

I saved the image to make sure that the size is the same and I reopened the image on AP and  I still have the same issue. Please take a look at the difference between the two screenshots of the same image:

 

Screenshot of the image posted on a forum.

 

Screenshot of the image on AP

 

Original

 

If you are confused you can save the original image above and open it on AP and then compare it with the posted it one.

 

Does anyone know why the quality becomes worse when I post the image compare with when I open on AP?