How to resize a image without looking blurry or pixelated?

[Niphura]

As the title says, i want to know how to resize an image without looking blurry or pixelated, is there any program? i already used photoshop, paint.net, gimp, and also a program called SmillaEnlarger

[Caligari87]

There's no detail "between" the pixels, so any upscaling is going to introduce artifacts. If you're okay with how they look, algorithms such as Scalex, xBRZ, and HQx can give a smoothed or semi-painterly look to the upscaling. GZDoom incorporates these natively in the High-Quality resize option, so you can play with that to see how they look.

[Niphura]

There's no detail "between" the pixels, so any upscaling is going to introduce artifacts. If you're okay with how they look, algorithms such as Scalex, xBRZ, and HQx can give a smoothed or semi-painterly look to the upscaling. GZDoom incorporates these natively in the High-Quality resize option, so you can play with that to see how they look.

In this case i need to reduce the size of the image...it is the same thing?

[Caligari87]

Well that depends. You can't shrink the image pixel size without losing data (and hence, quality).

If you want something high-res to render at a smaller scale, you can using GZDoom's features (like the Scale property in TEXTURES or DECORATE).

[hideousdestructor]

What kind of picture is it? Some filters should be better than others at prioritizing certain details over others, while if this is a smaller piece of pixel art it might be faster to manually edit and smooth out a pixelated resize than to find the exact algorithm that gets you what you need.

[Niphura]

Well that depends. You can't shrink the image pixel size without losing data (and hence, quality).

If you want something high-res to render at a smaller scale, you can using GZDoom's features (like the Scale property in TEXTURES or DECORATE).

You can do that with only with textures?

[ibm5155]

as long as you maintain the aspect ratio of the image and dont decide to reduce 50% of the original resolution you shouldn't have any kind of problem with gimp\photoshop