resizing image

[agoodphoto]

I went to use the filter to remove noise. I also wanted the jpeg artifact to be removed. After the operation, the file size of image was increased which is not good. The image is 6040 x 4040 and 31.5 mp's. I can not have it any more than 25 mp's. By how much do I need to reduce the size?

[ehume]

I went to use the filter to remove noise. I also wanted the jpeg artifact to be removed. After the operation, the file size of image was increased which is not good. The image is 6040 x 4040 and 31.5 mp's. I can not have it any more than 25 mp's. By how much do I need to reduce the size?

25/31.5=0.79 and a little, so you have to reduce your image 21%, I think, 79% of the original size.

[agoodphoto]

thank you, that helped.

[LeviFiction]

You don't need to resize your image, just use Save As and set the compression until it reaches the size you want.

PSP's compression algorthim is why a JPG will increase or decrease in size. When they first introduced it, the default setting would drastically shrink the image and people freaked out. They were afraid they were losing massive amounts of detail. When what was really happening is the algorithm was just really effective. Oddly the reverse is also true, when very little compression is applied the image jumps up in size, or if the algorithm that originally made the JPEG was more effective than PSP's then it'll appear to jump in size.

It's just how JPEGs work.

The best option would be to use Save As instead of "Save" as this will give you a slider (assuming you're using one of the lastest versions of PSP) right in the save dialog with an estimated resulting file size. So you can just move that slider until it matches your desired file size.

[agoodphoto]

thank you, I did not know this information.

[hartpaul]

In addition I found in earlier days when I had to get an image of fixed pixel size down below a certain KB setting that rather than change the compression which changes the overall image, I could selectively soften some unimportant parts of the image (soften brush) eg background trees, and this would reduce the disc size (KB) when I saved the image.

[agoodphoto]

thanks for the suggestion, hartpaul.

[rondo]

Jpeg Optimizer works well, no guesswork.

[agoodphoto]

I have PaintShop Pro 2018. Please tell me where this Optimizer is located, thanks.

[ehume]

On the File menu, find this:

Then do this:

[agoodphoto]

thank you so much.