Making a metafile for images? (And a general question about image res) - Techist - Tech Forum

Go Back   Techist - Tech Forum > Computer Technology > Digital Photography and Imaging
Click Here to Login
Reply
 
Thread Tools Display Modes
 
Old 08-10-2015, 02:07 PM   #1 (permalink)
Newb Techie
 
Join Date: Aug 2015
Location: United States
Posts: 2
Default Making a metafile for images? (And a general question about image res)

Hi. I am a total newbie to the tech world. I'm doing image research for a graphic designer and have run into two issues. Any help would be great. Thanks.

1. When I save an image to my computer, I was wondering if there was a way to attach some sort of text file with the link from where I got it. Is there a way to embed this in a jpeg, or to change the file to a format that includes both the text file and the jpeg without degrading the jpeg?

2. I am confused about how image resolution works. Let's say I find a jpeg image online, and I both take a png screenshot and save the image directly to my computer. Then I open both images on Photoshop. I blow up both images so that they appear to be the same size, although the screenshotted image is 1504 x 2000 pixels, and the jpeg 753 x 1000, so I have to blow up the jpeg more than I do the png. I was told that the jpeg is better quality, and that in the png I have actually lost information. However, when I zoom in like this, the png appears to be better quality--it's less crunchy looking. Does this "crunch" I am referring to actually have little to do with image quality, and what exactly makes the jpeg better quality?

Some screengrabs:

png:


jpeg:
__________________

__________________
ziggymacauley12 is offline   Reply With Quote
Old 08-10-2015, 02:24 PM   #2 (permalink)

Triforcer
 
Baez's Avatar
 
Join Date: Sep 2005
Location: Toronto, Canada
Posts: 6,987
Default Re: Making a metafile for images? (And a general question about image res)

Welcome to TF!

1. There's no way to embed text into an image file and guarantee it will appear elsewhere. Images like JPG and PNG do have metadata attached, which you can edit yourself within Photoshop, though it can easily be removed. Your best bet would be to display the image within HTML and add the text below the image.

2. PNG will always be better quality than JPG. PNG is lossless, meaning it cannot be degraded by compression, and JPG is lossy, meaning the opposite. The PNG saved will naturally look better.
__________________

__________________


Baez is offline   Reply With Quote
Old 08-10-2015, 03:54 PM   #3 (permalink)
Newb Techie
 
Join Date: Aug 2015
Location: United States
Posts: 2
Default Re: Making a metafile for images? (And a general question about image res)

Quote:
Originally Posted by Baez View Post
Welcome to TF!

1. There's no way to embed text into an image file and guarantee it will appear elsewhere. Images like JPG and PNG do have metadata attached, which you can edit yourself within Photoshop, though it can easily be removed. Your best bet would be to display the image within HTML and add the text below the image.

2. PNG will always be better quality than JPG. PNG is lossless, meaning it cannot be degraded by compression, and JPG is lossy, meaning the opposite. The PNG saved will naturally look better.
Thanks for the reply (and the welcome). That's too bad re: metadata.

I have another (related) question if you have a moment. While png is a lossless file type so it tends to be better quality, the way I got the png image was by taking screenshots. The problem wasn't the file type, but the fact that this method was faulty. I think it was that a screenshot runs the risk of being lower res than the original file, which loses information--enough that saving as a jpeg was actually preferable. Maybe I should save the image in a lossless format? I am on an OS X, and I don't see the option to change the file type when I try to save the image. Is there a way to do this? Thanks again.
__________________
ziggymacauley12 is offline   Reply With Quote
Old 08-10-2015, 04:11 PM   #4 (permalink)
Private Joker
 
carnageX's Avatar
 
Join Date: Feb 2007
Location: South Dakota
Posts: 24,889
Default Re: Making a metafile for images? (And a general question about image res)

Quote:
Originally Posted by ziggymacauley12 View Post
Thanks for the reply (and the welcome). That's too bad re: metadata.

I have another (related) question if you have a moment. While png is a lossless file type so it tends to be better quality, the way I got the png image was by taking screenshots. The problem wasn't the file type, but the fact that this method was faulty. I think it was that a screenshot runs the risk of being lower res than the original file, which loses information--enough that saving as a jpeg was actually preferable. Maybe I should save the image in a lossless format? I am on an OS X, and I don't see the option to change the file type when I try to save the image. Is there a way to do this? Thanks again.
Yes you should be saving it as lossless initially.

If it's not under the "Save As..." dialog, then it may be under the "Save for web..." dialog.
__________________
Laptop: MSI GT70 2OC-059us | i7-4700MQ | 16GB | GTX 770m | 500GB SSD / 750GB HDD | 17.3" | Win10 Pro
Desktop: 4690k | 12GB g.Skill RipJaws | GTX 970 | 520hx | Z87X-UD4H | Corsair Vengeance C70 | Corsair H110 | Acer 25" | Acer 22" | Win10
Mobile: Google Pixel XL


If I help you, or you just like what I said, rep me by clicking the under my post
carnageX is offline   Reply With Quote
Old 08-11-2015, 08:04 AM   #5 (permalink)

Triforcer
 
Baez's Avatar
 
Join Date: Sep 2005
Location: Toronto, Canada
Posts: 6,987
Default Re: Making a metafile for images? (And a general question about image res)

If you're not using the image for print (newspaper/magazine etc) then always use the "Save for web" option. That will also allow you to choose the file type.
__________________


Baez is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Keeping native monitor res...but lowering game res? Idahoan Monitors, Printers and Peripherals 2 05-12-2013 01:11 PM
EMF (enhanced metafile) rookie1010 Microsoft Windows and Software 3 11-12-2006 05:50 AM
Awesome Hi-Res Satellite Images Vincenzo Off Topic Discussion 12 09-23-2005 01:46 PM
how do u convert gif images to jpeg images? x Carmen x Web Graphics and Design 9 01-24-2005 01:09 PM
Forcing an 800x600 res program to run on a 640x480 res piggysmile Microsoft Windows and Software 9 05-13-2004 03:26 PM



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 07:14 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.