https://e621.net/post/show/650526/avian-bird-boca-car-chicken-grass-hi_res-macro-mic

https://e621.net/post/show/650412/argit-ben_10-boca-car-cloud-grass-hi_res-human-mac

how?

If an image is wider than 1600px or taller than 1200px then it can be tagged hi_res.

Boca said:
https://e621.net/post/show/650526/avian-bird-boca-car-chicken-grass-hi_res-macro-mic

https://e621.net/post/show/650412/argit-ben_10-boca-car-cloud-grass-hi_res-human-mac

how?

The use of the *_res tags is based off the height and width of the post in pixels.

The first one is 1698x2173 and the second is 1698x2194 so they get the hi-res tag.

You'll find more information on the tag's wiki page here: https://e621.net/wiki/show?title=hi_res

In addition to what everyone else said about image size, it looks like you scanned your pictures at a very high resolution, because you can actually see a lot of detail in the paper.

If you click on the Size: ####x####, you'll get an unscaled version and you can see why it's hi res.

The term "hi-res" is a bit of a misnomer. In this instance, it just means "an image of large size, exceeding 1600x1200 pixels." The actual image resolution, ie how many pixels per inch, has nothing to do with it. I could upload an 8-bit NES art style image that's larger than those dimensions and it could appropriately be tagged hi-res.

The reason is, I assume, because you're scanning your images in and uploading them without resizing. And without examining the images, I bet youre scanning them in at 150 or possibly 300 Dots Per Inch (DPI), which are the standard scanner resolutions. Not a bad thing mind you. But the reason your images come put as "high-res" is because standard digital image resolution is 72 DPI. Meaning that if you're scanning in at 150 DPI its making an image of more than twice the resolution of standard digital images.

Knotty_Curls said:
In addition to what everyone else said about image size, it looks like you scanned your pictures at a very high resolution, because you can actually see a lot of detail in the paper.

If you click on the Size: ####x####, you'll get an unscaled version and you can see why it's hi res.

####x#### ?

(oh, I see what you mean)