resize images with higher resolution?

[LordSnailz]

Let's say I have a picture I want to shrink in size, how can I increase the resolution at the same time? The problem is when I shrink the picture, shouldn't the picture printout be cleared than the original size? I was told that I should increase the resolution(dpi) when I shrink the image.

The picture was taken at 1200 pixels x 1600 pixels, and I want to shrink it to 3x4 in.

Using photoshop, any hints?

TIA!

 

[PrincessGuard]

Uh, the Image Size tool in Photoshop has a Resolution box under Print Size. Just set the size and dpi you want and PS will adjust the screen resolution for you.

 

[mryellow2]

Are you trying to prep it for printing? Turn off resample image when you go to resize. Should be at the bottom of the box that pops up.

 

[LordSnailz]

Thanks for the help guys ... yup! I'm trying to print a photo out of this picture. This is what I've done.

Open the picture in Photoshop, goto to Image Size and it shows width=11.3 height=8.5 and resolution. So what I did was disable 'Resample Image', chnage the resolution to 385, this shrunk my document size w=5.319 and h=3.99. Click okay and nothing changes in the picture.

Since I need the picture to be of size3x4, I then went Image Size and enabled 'Resample Image' and disabled contrained proportions and changed the width to 3 inches. The print out is still very pixelated. Any hints?

 

[Shagga]

Mryellow2 is correct. If you have a 1600 x 1200 image and turn off resample image and reduce the width to 4" the height automatically changes to 3" and the resolution will change to 400. You will not notice any change in the image. Thats ok. Print the image and you will get the best quality for a 4" x 3" pic. Do not resample as you lose clarity.

 

[LordSnailz]

How do I know if I have the "original" picture? Is there anyway to check? I've done what's listed above and it looks correct but the picture still comes out grainy ...

The picture I have is 2048x1536 JPEG image, and the size is about 859kb.

 

[LordSnailz]

I have another problem

I have 2 images sized 2048x1536, I'm using Photoshop to resize it to a smaller size.
-Image Size --> disable 'resample image'
-Change width=1inch and height automatically changes 0.75 and resolution goes up to 2048pixels/inch.

Now when I create a new file, and set the canvas size to width=10inch and height=4inch - How come the 2 picture takes up the whole canvas? Shouldn't they just be 1inch by 0.75inch? Print preview shows the two pictures taking up the 10inx4in.

Any suggestions?

 

[mryellow2]

When you create a new file look at what the dpi is set at. If it's not the same as the image you want to paste onto it you're going to get sizing issues.

 

[LordSnailz]

It's the same ... it's also set to transparent ...

 

[bunker]

After you increase the resolution and Photoshop reports the print size is smaller, the photo you see on screen will not look like it changed.

However, it will print at that smaller size. Do not check "resample image". It looks big on your monitor but will print small.

 

[Zucarita9000]

The image looks the same simply because your monitor isn't able to display more than 72 (or 96) dpi. However, your printer will notice the difference. Digital Cameras can't create files with high dpi resolution, wich is why the aim at higher pixel count (megapixels). The more pixels you have, the higher output resolution.
I have a digicam capable of 2048x1536. This is at 72dpi. Changing the dpi res. down to 300 will give me a nice lab quality printed 7x5 photo.

 

[notfred]

photoshop will display the image at it's actual pixel resolution, meaning that if you have a 1600x1200 image, it will show up as 1600x1200 pixels at 100% in photoshop.

THAT HAS ABSOLUTELY NO RELATION TO HOW IT PRINTS.

If you set the DPI to 300 pixels, without resampling the image, photoshop will STILL show it 1600x1200 pixels wide at 100% on the display. When you print it, it will be 1600/300= 5.33 x 1200/300 = 4... 5.33x4 inches.

You can not make your monitor display at 300 DPI, therefore you won't see a 300 DPI image in photoshop as the same size it will be on paper.

 

[Barnaby W. Füi]

Pay attention to the rulers, when you change the dpi, they will change.

 

[Shagga]

Originally posted by: LordSnailz
How do I know if I have the "original" picture? Is there anyway to check? I've done what's listed above and it looks correct but the picture still comes out grainy ...

The picture I have is 2048x1536 JPEG image, and the size is about 859kb.

I don't think you can tell really. Only by how good the picture prints I'm guessing. If the picture is grainy and you are printing at 300dpi it could mean that some resampling may have been carried out or you are trying to print the picture below, say 150dpi which can cause this grainy look. Some say however that depending on the quality of the printer the eye doesn't necessarily notice any difference between 300 and 150dpi (although technically there is).

A picture of 2048 x 1536 and JPEG is a 3.1 MP image and if I'm honest at 859kb sounds as though it wasn't taken at the highest quality, could be wrong though. I know that on both my IXUS 2.1 MP camera I got 1600 x 1200 pics and they were about 1mb in size on the highest setting and my IXUS 4MP camera tends to take pics around the 1.5mb (forget the size, heads no working this morning).

What I have found whilst printing photos, is that is is so important to not only have a good high resolution picture, you also need a printer (with the highest resolution, some say 1440dpi as a minimum) and photo paper of equal quality. I had a HP Deskjet 890Pro which printed at 300dpi and to be honest ALL my pics looked grainy. Printer quality is of huge importance if you want photo quality pictures. Sorry for stating the obvious but it's true.

As an example I have an Canon IXUS 400 Digital Camera (4MP), a Canon S9000 Printer and I use Canon's Photo Paper Pro (Ref: PR101?) and I can get away with a full A4 size photo quality print, which doesn't print at 300dpi.

Hope that helps.