pasting image changes the file size

Question

It's more of a situation than a question here.

I have a .jpg image, 1048x494, 193 kb. If i attach the image to the card as an attachment, the file size remains the same. However if I copy the image within photoshop and paste onto the card, it will create a 16 mb png.

I've been using trello for close to 5 years and I just found this out recently. I checked with my colleagues and nobody noticed it either.

ADDING IMAGE BY PASTING RATHER THAN UPLOADING AS ATTACHMENT SIGNIFICANTLY INCREASE THE SIZE OF YOUR CARD.

Soumyadeep Mandal - SaM · Answer

Hi @CGPB

The thing is when the image gets more data on it increases its size!

It's not a Trello's issue! It is happening because of copy/paste from different places!

When Trello is getting those images that have more metadata or similar data inside the file which can't be seen in the image visually it increases and decreases its size automatically!

If you think it was a bug in Trello, you can definitely ask Trello support!

CGPB · Answer

AND here's another even more bizarre situation, which unfortunately I didn't not screenshots to prove.

I once pasted the a image twice and got two difference sized png. one 10 times of the original, and one 100 times of the original. unfortunately I didn't screen capture the result and can not recreate the "bug"

LOL I feel like a QA test at the moment!

CGPB · Answer

as you can see, not a PSD was created, at least it was not named by trello.

so it made me curious, therefore I did another test, without having photoshop involved at all.

here is another image I found randomly online

if I save the image, I will get a file of 136kb

however if I right click and copy the image on internet then paste it onto the trello card, I then get a 1.19mb png

so it has nothing to do with photoshop. It has everything to do with how trello calculate uploaded file and copy/paste file.

Is there any help file tells the user upload image files rather than copy/paste. If there isn't any, then there should be, because I can see how often copy/paste functions appear in our life.

I'm an art teacher and we use trello for homeworks. I'm sure you can imagine how huge our board becomes at the end of the semester.