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» The Letterville BullBoard » Old Archives » Enlarging a jpg.

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Author Topic: Enlarging a jpg.
Randy Jones
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Member # 2795

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We have a customer that wants a picture from his website put onto his vehicle.We made him a few but he wanted them larger.We made them the same size as the ones on his site but cannot figure out how to make it 24" instead of 6".
We have an edge and omega program is there something else I have to use to take a downloaded pic and enlarge it to the size I need?
Thanks in advance for your help.

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Randy Jones
Speed FX
P.O.Box 43094
Baltimore,Md.21236 U.S.A.

Keep looking up...

Posts: 77 | From: Maryland | Registered: Mar 2002  |  IP: Logged | Report this post to a Moderator
Joe Rees
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Hi Randy,
Blowing up a jpeg from a website 400% isn't a pretty thing. I'm tempted to say it just won't work at all, especially if it's anything with lettering on it, it'll be a garbled mess. Those are usually 72dpi or maybe 96 dpi at best. That'll be about 18dpi enlarged, scary.

[ June 29, 2003, 08:28 PM: Message edited by: Joe Rees ]

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Joe Rees
Cape Craft Signs
(Cape Cod, MA)
http://www.capecraft.com
e-mail: joe@capecraft.com

SONGPAINTER Original Sign Music by Sign People NOW AVAILABLE on CD and the proceeds go to Letterville's favorite charity!
Click Here for Sound Clips!

Posts: 1974 | From: Orleans, MA, Cape Cod, USA | Registered: Nov 1998  |  IP: Logged | Report this post to a Moderator
Curtis hammond
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it will be full of jaggies, no way, he has to give you a high resolution pic.... JPEG are LOSSY compression.

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Leaper of Tall buildings.. If you find my posts divisive or otherwise snarky please ignore them. If you do not know how then PM me about it and I will demonstrate.

Posts: 5278 | From: Im a nowhere man | Registered: Jul 2001  |  IP: Logged | Report this post to a Moderator
Ian Stewart-Koster
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If he has a pic on his website, then he'd have the original of the pic, or so my optimistic logic says. Get that and work with it if you can. If it's basic, you could blow it up in Photoshop and 'recreate' it on another layer, setting the new document's resolution to say 300 pixels per inch. A 72 ppi blown up to 300 to print will look way too out of focus as the printer has to 'invent' the in-between pixels.
Running 'Unsharpmask' helps a lot just before printing too- it'll improve pretty well every scan.

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"Stewey" on chat

"...there are no limits when you aim for perfection..." Jonathan Livingston Seagull

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Mike O'Neill
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I never condemn a pic sight unseen, I've performed too many 'miracles' in the past, it all depends on the image.. send a link to the pic

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Mike O'Neill


It has yet to be proven that intelligence has any survival value.
- Arthur C. Clarke


mike@copyshop.ca

Posts: 3094 | From: Labrador City, NF, Canada | Registered: Nov 1998  |  IP: Logged | Report this post to a Moderator
Bill Biggs
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I have done that with pretty good results
by leaving the picture small and letting
the edge enlarge it in the output .
That way gerber will do the best it can.
set it on process colors and gerber tone photo
set some cut lines and output a piece of it if you like, in case you don't get what you want there won't be so much waste.
Bill

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Bill & Barbara Biggs
Art's Sign Service, Inc.
Clute, Texas, USA
Home of The Great Texas Mosquito Festival
Proud 10 year Supporter of the Letterheads Website
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MailTo:biggsbb@sbcglobal.net

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VICTORGEORGIOU
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There are a couple of products that will enlarge bitmaps with no apparent loss of resolution. One of them is VFZoom from Celartem at http://www.celartem.com

There are no jaggies in the finished image.

They used to have a demo download at their site. The product itself is about $150, I think.

Personally I think it is a useful product. Vic G

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Victor Georgiou
Danville, CA , USA

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Alan Ackerson
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In my opinion Victor G. has the best solution if superior quality is a must.

Through experimentation I found if using Photoshop's "Unsharpen Mask Filter" mentioned above after scaling, it is good to run the filter twice. Once with high radius-low amount and then low radius-high amount the second time.(Possibly reversing the order of commands I just mentioned)It acts like tune and fine tune. Sharpening of an image should be performed 99% of the time after scaling an image larger or smaller.

This will help if you have to go that route.

If the author of the image can send you a .bmp(which is rgb only) or a .tiff or .eps it would be much better since a .jpg has already been compressed at least once.

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Alan Ackerson
LetterWorks Design and Graphics
alan@ack2.com

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William Holohan
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Hope the following helps someone. Here is what I do with web graphics.

Download the graphic

Save as a tif

Reduce size by 50% without resample

I use Photoshop 6

In channels, all three, rgb, gausian blur by 0.5
pixels.

In unsharp mask, first set amount to 500%
Radius to 0.1 pixels
Hit OK
Second set amount to 6%
Radius to 200 pixels
Hit OK
You may have to tinker here for best results.

Make adjustments to contrast/brightness as your eye demands.

Print the results on matt photo paper at best setting your printer allows.

Scan the result at 400% at 400 dpi.

You should then have artwork that can be fondled with in many ways.

If I have to manually retrace, I scotch tape the
tracing paper to my monitor screen over an enlarged version of artwork.

I may get better results by changing the artwork to greyscale and raising the contrast and then saving and bringing it in to Adobe Streamline to vectorize.

This method at least gives me artwork that I can reasonably manipulate.

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William "Irish" Holohan
Resting...Read "Between Jobs."
Marlboro, MA 01752
email: firemap1@aol.com

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Joe Rees
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Member # 211

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Hey Victor, that VFZoom looks absolutely amazing. At first glance, I'm highly skeptical, but then I'm constantly amazed by the new stuff that comes out. Thanks for the link.

--------------------
Joe Rees
Cape Craft Signs
(Cape Cod, MA)
http://www.capecraft.com
e-mail: joe@capecraft.com

SONGPAINTER Original Sign Music by Sign People NOW AVAILABLE on CD and the proceeds go to Letterville's favorite charity!
Click Here for Sound Clips!

Posts: 1974 | From: Orleans, MA, Cape Cod, USA | Registered: Nov 1998  |  IP: Logged | Report this post to a Moderator
Alan Ackerson
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Thanks for the added tips William.

--------------------
Alan Ackerson
LetterWorks Design and Graphics
alan@ack2.com

Posts: 776 | From: Oak Ridge, NJ | Registered: Aug 2002  |  IP: Logged | Report this post to a Moderator
   

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