how to make the file big?

me_sarika · 02-19-2007

I'm into digital printing and need high resolution gud quality images. NOw at times we get images which are really small in size and if I try to increase the size or resolution then it gets pixellated. Can anyone help me know how can I convert a small gif file to an big file without making it pixellated? Thanks in advance.

Rtouch · 02-19-2007

I would love to help you. how high is the resolution of the image.
It is a logo or a photo of someone if it is an logo for example then you can try to convert it to vector graphic. It you convert it to vector then you can increse the imgae how much you want. I am not so sure this will help you but maybe.

me_sarika · 02-19-2007

The file is a image in gif format 72dpi and 8KB but I need atleast 300 dpi resolution for printing. Pls advise.

**tamlin** · 02-19-2007

The problem that you will encounter is that GIFs contain relatively little image information compared to other formats. When you enlarge a digital image, the software attempts to "fill in the gaps" with data derived from that which is already there. Obviously, if there is very little data to start with, the software is going to struggle.

I think if you are to have any success at all you will need to firstly change the Image Mode from Indexed Color to RGB Color. You can then try Image Size to resize and change the resolution of the image. If you have CS2, selecting Bicubic Smoother from the Resample Image dropdown menu will probably give you the best chance of success.

If you want to try a 3rd-party plugin, I have had excellent results with Alien Skin's Blow Up. Have a look here: Blow Up

If you've only got a few images to resize, they offer a fully-functioning 30-day demo version.

stiney51 · 02-19-2007

At that small of a size gif, you are never going to be able to increase the total size of the image. You can change the resolution to 300 dpi, but to offset this you would need to make the whole image smaller.

Also depending on what type of printing you are doing, you can often get away with a slightly smaller DPI than 300. For most home printers and for newsprint for example, 200 DPI is usually sufficient.

A lot depends on how big you need to enlarge the image and the quality and original size of the image. If this is something you designed, you may have to go back to the drawing board friend...

**tamlin** · 02-19-2007

Quote:

Originally Posted by stiney51

At that small of a size gif, you are never going to be able to increase the total size of the image. You can change the resolution to 300 dpi, but to offset this you would need to make the whole image smaller.

Actually, in Photoshop, if the only image size parameter you increase is resolution, the image size (in terms of width and height pixels) increases accordingly. Try it out - I took a 72 dpi GIF and changed the resolution to 300 dpi. The dimensions increased from 200 x 140 pixels to 834 x 583 pixels. It did look pretty horrible, though. Slightly better results were had by changing the mode to RGB color before the resolution change.

stiney51 · 02-19-2007

Quote:

Originally Posted by tamlin

Actually, in Photoshop, if the only image size parameter you increase is resolution, the image size (in terms of width and height pixels) increases accordingly.

tamlin, We are both saying the same thing here, I was just pointing out that he could adjust the resolution, but without also adjusting the dimensions down in size he would see a large amount of pixel-ization. (is that a word?)

**tamlin** · 02-19-2007

Oh right - I'm with you now! Yes, if you increase the resolution of a GIF, the pixels become very obvious. If you change the mode from Indexed Color, however, the bicubic interpolation does a bit of anti-aliasing to attempt to compensate. How this looks in the final image depends very much on what you've got to start with.

arb · 02-19-2007

what's the difference between these two jpg and what does it mean in practice?

http://home.wanadoo.nl/arbrouwer/test_72.jpg
http://home.wanadoo.nl/arbrouwer/test_300.jpg

they are both 909 kb

stiney51 · 02-19-2007

Was this a rehtorical question, or were you serious with this?

Being that it is a solid color, there's very little difference between the two. The DPI would really only come into play with a more complex image.

**tamlin** · 02-19-2007

Actually, if you read my post in this thread: http://forums.biorust.com/biorust-sp...html#post36904 (resoultion:file)
you'll see that DPI is more or less irrelevant when it comes to web graphics. DPI is more important in printing.

Arb: those two squares might look the same on your computer screen, but try printing them out with no scaling. The 72dpi square will print out at 3.53cm x 3.53cm, while the 300dpi square will print out at 0.85cm x 0.85cm.

arb · 02-19-2007

Quote:

Originally Posted by tamlin

Arb: those two squares might look the same on your computer screen, but try printing them out with no scaling. The 72dpi square will print out at 3.53cm x 3.53cm, while the 300dpi square will print out at 0.85cm x 0.85cm.

No Stiney, I was serious (this time).

Thanks Tamlin, I understand now because of the way you explained this matter. Loud and clear. To me, on the internet the stories about this are far too extensive and half way they sometimes mix PPI and DPI.

Thanks again,

Ton

Kathryn69 · 11-20-2007

I found blowup will really smooth out the image, almost like 'image doctor' or photoshop smart blur, and you tend to loose any edges that the small image might have to begin with. When the image is blown up larger size and larger resolution there is really no detail. Do you know how to stop that from happening? I get those darn 100 X 100 32res image packs and wish the images were just a little bigger to use.

**tamlin** · 11-20-2007

Quote:

Originally Posted by Kathryn69

I found blowup will really smooth out the image, almost like 'image doctor' or photoshop smart blur, and you tend to loose any edges that the small image might have to begin with. When the image is blown up larger size and larger resolution there is really no detail. Do you know how to stop that from happening? I get those darn 100 X 100 32res image packs and wish the images were just a little bigger to use.

As discussed above, when you enlarge a digital image (with whatever method you choose) Photoshop has to provide its own content to "fill in the gaps". Blowup's method is to increase the smoothing of the image (filling in the missing pixels with those of a similar colour to the adjacent ones). Sometimes this looks OK, sometimes it doesn't - it depends very much on the quality and complexity of the starting image and the degree of enlargement. The bottom line is that there's no magic plugin or technique or built-in Photoshop option that is going to restore pixels that weren't there in the first place.

QuebecGuy777 · 12-10-2007

You should retrace it in Illustrator !