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setting picture resolution(dpi)

Posted on 2003-11-07
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Last Modified: 2013-12-13
How do I check and change the pictures resolution.  I think 72dpi is best but I haven't figured out how to set it in fireworks.
thanks
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Question by:livegirllove
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17 Comments
 
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Expert Comment

by:zenlion420
ID: 9706275
Hello livegirlie,

you can click on your image, and on the optimize tab to the right of the canvas there is a place where you can define the quality of the outputted image.  do you need a way to specify exact dpi?

j
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Expert Comment

by:zenlion420
ID: 9706278
cause you can always select the image type you'd like to use (ie:.jpg, .gif...) then use the slider to grab the correct dpi setting.

example, click a pic, on optimize tab, choose "jpeg - better quality", then use the little slider dealie to select the dpi you'd like

to hit the whole canvas, goto:

modify>canvas>image size

there is a setting in there that will make global dpi changes if you'd like

j
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Author Comment

by:livegirllove
ID: 9707610
yeah but where do I go to see what a .jpeg currently is?  Is that over in the optimize bar where it says quality or selective quality?
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Expert Comment

by:zenlion420
ID: 9707626
something else that might prove helpful for you to know is that you can compress different areas of a jpeg to different levels.  this is from FW manual:

To compress selected areas of a JPEG:
In Original view, select an area of the graphic for compression using one of the Marquee tools.
Choose Modify > Selective JPEG > Save Selection as JPEG Mask.
Choose JPEG from the Export File Format pop-up menu in the Optimize panel, if it’s not already selected.
Click the Edit Selective Quality Options button in the Optimize panel.
The Selective JPEG Settings dialog box opens.

Choose Enable Selective Quality and enter a value in the text box.
Entering a low value compresses the Selective JPEG area more than the rest of the image. Entering a high value compresses the Selective JPEG area less than the rest of the image.

Change the Overlay Color for the Selective JPEG area if desired. This does not affect the output.
Select Preserve Text Quality. All text items will automatically be exported at a higher level, regardless of the Selective Quality value.
Select Preserve Button Quality. All button symbols will automatically be exported at a higher level.
Click OK.
To modify the selective JPEG compression area:
Choose Modify > Selective JPEG > Restore JPEG Mask as Selection.
The selection is highlighted.

Use the Marquee tool or another selection tool to make changes to the size of the area.
Choose Modify > Selective JPEG > Save Selection as JPEG Mask.
Change selective quality settings in the Optimize panel if desired

NOTE>>To undo a selection, choose: Modify>Selective jpeg>Remove jpeg mask


j
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Expert Comment

by:zenlion420
ID: 9707640
another thing is that before you export, look at the export preview to view your file size and make last minute changes.  you can see the quality of the images change immediately with the adjustments you make, so you can find exactly what you'd like as a balance.

j
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Author Comment

by:livegirllove
ID: 9707645
thats good to know, so I can make the image smaller in bandwidth but keep the text clear.
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Author Comment

by:livegirllove
ID: 9707651
yeah I've been doing that but the person I'm designing the website for has heard from a friend and takes it as gospel that all images on the site must be 72dpi so I'm just trying to make her happy.  
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Expert Comment

by:zenlion420
ID: 9707652
sorry, didn't know you were posting, i was just thinking of every possible way i know of for you to control file size.  yeah, it's a really neat feature.  good for making a high quality focal point on an image, but not keeping the same quality for thet background, or like you said, keeping text clear.

still thinking,

j
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Accepted Solution

by:
zenlion420 earned 1000 total points
ID: 9707676
if all images have to be 72dpi, just use the "modify>canvas>image size"

change the resolution to 72 dpi there.

just make sure you lock in your image dimensions.

j
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Expert Comment

by:zenlion420
ID: 9709033
anything?

j
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Author Comment

by:livegirllove
ID: 9710622
My ac apadpter for my battery broke.  Dell is overnighting one to me.  Will be here monday hopefully.  I have just enough battery to check email this weekend so i''ll let you know on monday whats up.
thanks
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Author Comment

by:livegirllove
ID: 9710841
if all images have to be 72dpi, just use the "modify>canvas>image size"

thats what I needed!!
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Expert Comment

by:zenlion420
ID: 9710846
:) well there you go.

that was my first answer, but i figured i'd give every way i knew to possibly control it.

j
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Author Comment

by:livegirllove
ID: 9710859
just make sure you lock in your image dimensions.
what did you mean by this?
If I save the picture after changeing DPI  that should be it right?
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Expert Comment

by:zenlion420
ID: 9710875
well yeah, that's it.  what i mean is that FW has a tendency to want to change the image dimensions when you change the res if you have "constrain proportions" selected.  for instance, instead of degrading the quality, it will want to make the image smaller in dimensions so you'll still achieve the requested dpi, but the quality is maintained.  what you want is the dimensions to stay where you want them, and degrade the quality of the images.  whenever i adjust pics like this, i write down the top number (width), leave the "constrain proportions" selected, change my resolution, and if it wants to adjust the dimensions, i plug the width back in and i'm all set.  let me know if this doesn't make sense.

j
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Author Comment

by:livegirllove
ID: 9710976
perfect thanks
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Expert Comment

by:zenlion420
ID: 9711028
no prob :)
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