AutoCAD LT :: Raster Image - Changing Pixel Size But Still Maintain Scale
May 18, 2012
So we've been sent a DWG file for a large site, that includes a massive aerial (TIF) image.
At this point it's too large to even work with so I'd like to scale it down (proportionally, so it will still maintain the same aspect ratio).
For simplicity sake, lets say the image is 15,000 x 15,000 and I want to scale it down to 5,000 x 5,000.
The problem is that AutoCAD seems to use that pixel size to determine the actual scale, so when I updated the new (smaller) image, it was also 3x smaller in the world.
How do I scale down the image independently of the size so it will still maintain the same scale in the CAD world? (I'm a 3D guy so this is akin to scaling down a texture, yet having the plane its projected on maintain its original scale.)
I have some issues with Raster Image lately when I wanted a scanned jpeg of 210 x 297 mm (a4 dimension) that I want to fit into a 180x220 mm rectangular box in Autocad. I have used Photoshop CS 3 to change the image size to 180x220.
However when I insert the Raster Image files, some files are automatically set to 180x220 (as expected) and others are scaled down and I have to re-scale them (reset the scale value to 1, change the x-value and the y-value is automatically changed, but on the overall it is 180x220, sometimes x is more than y or sometimes y is more than x, but within 1-3 mm)
I want to know :
1. What is the best principle or techniques of knowing/changing image dimension (mm) 2. How to be able to scale raster image in x-axis and y-axis independently of one another? 3. Remove white background to neutral background?
I can not use my HP scanner. It looks like the image size is wrong and should be reduced to less than 49999 pixels high x 4999 pixels wide. Where could I change the image size in X4. Using Windows 7 Pro.
how is the import scale for a raster image determined?
I've different scanned sketches of floor plans drawn by hand to specific scales, the resize tool is not quite accurate enough for my use. Does the view scale have anything to do with it?
I've just recently changed jobs and so I'm working on a new (to me) system with Autocad Mechanical 2013. I had been working with Mechanical 2010.
One (of the many) issues that is bothering me, is that I can't seem to scale resize individual dimension. Normally, I'd create the dimensions and then if I needed to tweak the fit, I'd go into the Properties pallet and change the overall scale under Fit. Not really a good standard of practice, I know...
But when I do that on my current system, the dimension doesn't change at all.
On top of that, I have a weird refresh problem. If I grab a dim by the grip and move/stretch it, it doesn't actually show the new position unless I Regen. Is that a setting or maybe just a slow reaction by my computer?
When changing brush size in CS6, I've noticed that it is has granular resolution from 0 pixels up to around 500pixels, incrementing in size very slowly. However, above 500 pixels it increases in size very rapidly, jumping to 800, 1200, 1500 and then into the 2000s.
As most of the photos that I work on have a high pixel count I find that my ideal brush size is between 400 and 1000, occasionally I use it at around 100 pixels, and occasionally at 2500.
Is there any way of changing the scale of the brush size so that it allows greater sensitivity in the 400 to 1000 range?
I want to change the size of the image in Gimp to 3957x4429 px (67x75 cm) at a 150dpi (the image we have has a 300 dpi.) When i do this in image - print size it keeps changing the width.
The system is not allowing me to get the picture a few cm larger. Is there any way I can overwrite this?
It blows my mind that somthing this simple isnt all that simple. I used the eyedropper tool to slect a color from another photo, then used the brush while fully magnified to change the color of each pixel.
It was coming out a weird greyish color, and I noticed that if I clicked more than once, it got darker, but so did the pixels directly around the one i was editing. So, i copied both pictures, loaded them into paint, and went to town.
It worked, but then when i copied it back into photoshop, it had a black background (there was no background in the original pictures) around the sprite I was editing. I tried to use the magic wand tool to get rid of it, but it took parts of the sprite with it, so...
Is there any way that I can edit the color of a single pixel (or hell, even a group of pixels if they share the same exact color would be nice...preferred, even) accurately? If not, what program could I use that would keep the transparent background?
i get a 1 pixel size image when I double click the zoom for 100%.Fit screen or full screen is wacky too, not fitting or filling and sometimes going way beyond.
"Image > Print Size" really IS the command you are looking for.
The key is to pay attention to the units-of-measure shown on the Print Size dialogue box:- The "Width" and "Height" values under Print Size are displayed in real-world units (inches, mm, etc.), not image pixels.- The "Resolution" values are displayed in pixels-per-unit.- You cannot change your image's pixel dimensions (aka scale the image) from the Print Size dialogue. That's what the "Scale Image" command is for.Remember the relation between pixel and print sizes is:(print size) = (pixel size) / (print resolution)
When you change the image's print resolution, of course the real-world size (the "width" or "height" shown in the Print Size dialog) of your image will update to reflect the new print resolution -- that value is calculated from your image's actual pixel size and whatever resolution value you just entered. This is totally normal behavior -- in fact, it's expected. If you change an image's resolution from, say, 150 pixels/inch to 75 pixels/inch, this doubles the print size of your image but only the print size; the image's pixel size remains precisely the same as before. (You can confirm this by comparing "Image > Canvas Size..." before and after changing the resolution.)
And as others have stated, if you're using the image for Web viewing then its print resolution has absolutely zero effect on how it will appear onscreen (print resolution only affects, well, actual printing), in which case you'll want to use the "Scale Image" command to actually scale your image larger or smaller.
If I change the size of, say, the "file open" box, and shut it down, then open it again, it goes back to the default small size. Is there a setting that I can change so that the dialog box size stay's to my selected size?
I would like to find a lisp that changes the scale of something that has an annotative scale and deletes all other scales in the object scale list. Often i have many different scales of existing dimensions or objects. i waste a lot of time opening the annotation object scale dialogue box, selecting add, finding my scale and deleting the old scale.
How do you scale a layer proportional to the image size?
I want to scale a layer so that it's 10% of the width of the full image. It's going to be part of an action, so I can't just do the math, and do it manually.
What is the difference between the outcome of using the new content aware scale versus just going ahead and resizing the image? Or is this a matter of preference?
When i enlarge the size of an image (using free transform, or scale) in photoshop CS2, the resized image gets blurred (or smudged) as soon as i've accept the larger size. How can i prevent this from happening? I'm trying to work with few pixels, and when it smudges the edges i get tons of colors i don't want.
I drag the graphed box to scale an image down (or up) and after clicking "scale" the image size decreases but the original box is there (original size). Why?
Is there any way I can scale images down in size, whilst keeping the quality of the image? I am a Media teacher having to use this software with the class and they must have high production values for their controlled assessment. However, I do not know how to get around the problem that all the work is predominantly blurred because students have scaled down the pictures resulting in horrendous blurring.
I have to process a couple of thousand photos. What I need to do is get PS to resize the canvas so that Height=Width, no matter which is the larger. In the area where it increases the canvas size, it should then have white space.
So that for a 10x5 landscape picture, it resizes to be 10x10 canvas, for a 5x10 portrait picture, it resizes to be 10x10 canvas, etc.
How to resize the image without changing the size of the background? When I try it makes the picture fit exactly into the background when that is not what I want to do. Also the image is in a different layer than the background .
