Enlarging images while maintaining resolution

I understand that images can't be enlarged without some compromise in resolution.  However, I've seen a tutorial on image enlargement, using Photoshop, where the enlarged image appeared at least as clear as the smaller original. http://www.howtogeek.com/105952/3-simple-ways-to-improve-low-resolution-images-and-typography/    In that article, an image was enlarged 2000%, and there was improvement in the clarity!  I've tried this technique on some small images, but my results are unacceptable.  If you can enlarge the attached images so they can be printed at 8.5" x 11" without blurring or pixilation, please do so.

Image 1Image 2Image 3Image 4
ddantesAsked:
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Joe Winograd, Fellow&MVEConnect With a Mentor DeveloperCommented:
Hi David,

Here are the other three:

Bokar-Rinpoche-2 resized to 11h IrfanView
dalai-lama resized to 8.5w IrfanView
dalai-lama resized to 8.5w IrfanView
I resized them preserving the aspect ratio and picking the dimension that kept the width not larger than 8.5 and the height not larger than 11.0, but I don't know if the clarity is sufficient for you. Regards, Joe
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Joe Winograd, Fellow&MVEDeveloperCommented:
Hi David,
I resized the first one using IrfanView to a width of 8.50 inches, but by preserving the aspect ratio, the height is 10.01 inches, not 11 (I figured you would not want to skew the photo):

17th-DSC-ok6286 resized to 8.5w IrfanView
Let me know if this meets your needs. In the meantime, I'll work on the other three and will post them as soon as I'm done. Regards, Joe
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ddantesAuthor Commented:
Thank you Joe.  I'll need to print these tomorrow, to see if the clarity is adequate.
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Joe Winograd, Fellow&MVEDeveloperCommented:
You're welcome, David. Let me know if the clarity is not adequate and I'll look into some other tools. Regards, Joe
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ddantesAuthor Commented:
Thank you for that offer.  The first photo prints clearly, but the other three do not.  I know the originals were small, and not of the highest quality to begin with.
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Joe Winograd, Fellow&MVEDeveloperCommented:
I had a hunch that would be the case. Your original of the first one is 97.6KB (decent size, although still on the small side as images go), but the other three are just 5.7KB, 10.8KB, and 7.1KB — not enough pixels to do much with, but I'll still look into some other tools. You mentioned Photoshop — have you tried it? I don't have Photoshop, although a client of mine does and I should be able to get access to it. But if you have it, then give the tips in this article a spin:

http://lifehacker.com/5885661/improve-the-quality-of-enlarged-images-with-these-photoshop-tips

I do have GIMP and I'll give that a try. Regards, Joe
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ddantesAuthor Commented:
I do have Photoshop, and I tried the techniques published in the article which is mentioned in the original posting of the question.  That only worked for the first photo.  The same article is reproduced at the link you provided.
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Joe Winograd, Fellow&MVEDeveloperCommented:
Oops...didn't notice that the links were to the same article. I'm guessing we don't have enough pixels to play with in those other three. I'll try GIMP later today (and some other tools) but am not very hopeful.
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Joe Winograd, Fellow&MVEDeveloperCommented:
David,
I took a crack at the largest of the other three images (10,782 bytes) with GIMP. I resized it to 8.5" wide, then used GIMP's Enhance tools to Antialias and Sharpen it (50), then exported it as a JPG with quality 100. Here's the result:

dalai-lama-GIMP
I'm doubtful that the quality will be satisfactory for you, but it was worth a shot. If you like it, I'll be happy to do the other two with the same technique. Regards, Joe
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ddantesAuthor Commented:
Hi Joe:  Thanks for the effort.  I don't think there was sufficient information in the original photo to tolerate enlargement, but it was worth a shot.  Happy Holidays!  David
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Joe Winograd, Fellow&MVEDeveloperCommented:
David,
I think that's exactly right. Happy Holidays to you and yours. Mahalo, Joe
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