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nostupidquestionsยทNo Stupid QuestionsbyQuinnyCoded

how can text from an image not show up in a thumbnail?

ok ignore the image, my brother calls me a foid as a joke and I said we're gonna get these matching shirts ๐Ÿ˜ญ

BUT how is the text on the shirt on the image I downloaded (this) but NOT on the thumbnail when I go to send it to my brother?

I haven't seen this happen to any other photo I've ever downloaded and I've uploaded a lot of shitposts on my phone (I have over 300 posts just on Lemmy)
the file said it was just a standard .jpg

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11 replies

Shadow
lemmy.ca

You edited the image and the embedded thumbnail inside the image exif didn't get updated.

44

Such files with the .jpg extension are known as Progressive JPEG (progressively higher resolution copies of the image). Not to be confused with progressive scan video, as opposed to interlaced like NTSC. In turn, that should not be confused with Adam7 interlaced PNGs (which, ironically, accomplish the same goal as Progressive JPEG).

It's possible but unlikely that the editing program would just copy the original low-res copies. Maybe a thumbnail cache needs to be rebuilt?

2
fedinsfw.app

Also, tell your brother to get funnier jokes, fr ๐Ÿคข

14
QuinnyCodedreply
sh.itjust.works

nooo!! its just sibling banter, it's not meant to be mean ๐Ÿ˜ญ๐Ÿ˜ญ

edit: also we changed the idea to be

"I'm with the foid ๐Ÿ‘‰"

and then I wear the shirt

"I'm with the chud ๐Ÿ‘ˆ"

5

Oh it's mean, but siblings are like wolves, we gotta toughen each other up. Haha

1

Image files can contain thumbnail exif data. Basically the thumbnail isn't created on the fly every time its needed, it's a second image in the same image file. Some software doesn't edit that exif data when it edits the image, so you can end up with a mismatch like this.

Try a different image editor

8
lemmy.world

this is actually an original feature of jpeg.

back in the day of dialup internet you could embed a smaller thumbnail in the exif data of the jpeg that would load first, faster.

this would allow your website to be "populated" with content but at a lower quality while the full image continued to load in the background.

in the early internet these were even used sometimes to create single play "gifs" that were of a superior quality that gif just couldn't render.

8

Depends where you downloaded it from. If you downloaded it by long pressing and saving the image on a website that was rendering the text as a separate layer above, then you only got the image. When you take a screenshot instead, you get the image as you intended.

3

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how can text from an image not show up in a thumbnail? | Spyke