Editing programs enlarge a digital photo


Effects & defects often happens that those “added” to a photograph have an unpleasant aura around it, due to the fact that the selection often brings with it the pixels belonging to the background of the subject ” clipped .” To cushion the defect , you can use the Feather Selection menu , which creates a softer transition between the selection and the background. If the cut-out portion must also be modified ( enlarged or distorted for example) can be useful to create a rectangular cutout around the subject , paste it into a new file , do the editing and only at the end of the run the same exact selection of the subject be bonded (always with the Feather Selection active) . This artifact montage are minimized .
Editing programs allow you to zoom in on a detail of a digital photo , but often the result is deludente.Ecco what you need to know to get enlargements of the author.
Do you remember the ” dot syndrome ” ? No? Yet it affects most of us , especially during the holidays. What happens is that you are visiting a famous monument and you want to snap the classic souvenir photo. Then he gave the camera to a spouse / friend / bystander ( ” just hit here , does everything by itself ” ), and there he poses in front of the main door of the Cathedral, the bell tower of St. Mark, the statue of David. Back from vacation, you show the photos to colleagues.
” This is me , in front of the Leaning Tower Bridge ” , please explain . And the colleague ”

But where are you? ” And you ” are the blue dot to the right of the entrance … ” Dot Syndrome , in fact. The error that transforms us into colored dots is put too close to thefeature-video-movies-roxio-creatormonument: instead , you have to be close to the lens , and let the prospect do its job .

Good to know for next time, but for the photos have already been made there is no remedy ?

Obviously , the clear and unequivocal answer is: it depends !

Best film ?
Well, yes, if you took the picture with a film camera , with a good goal , chances are good that the ” dot ” visible in the press really is immortalized on the negative with a much greater level of detail . This is because the grain of a film ( especially at low sensitivity) , and its level of detail , equivalgonoa to digital photos taken with machines and more than 12 megapixels . It is therefore likely that the media is visible far fewer details than has actually been captured by the film. In this case, a negative scan performed with a professional scanner can restore the detail necessary to ” save the picture ” . If you start from the digital , however, room for maneuver will be minimal : the digital pixel array in fact lend itself magnification.

Guide To Solving Malfunctions

Especially if the pixels are very few (eg, a detail from about 100×150 points), it is difficult to obtain significantly enlarged without obvious loss of quality. The root of the problem lies in the fact that it is true that a pixel can be any size ( a pixel on an LCD monitor measuring 0.25 mm , but on the scoreboard of the stadium comes to 5 cm) , but all the pixels in an image are great equal. To zoom in on an object and then I have to increase the number of pixels of which it is composed , but doing so will not get more detail. If , for example, doubling the size of a particular , in place of each pixel will have a block of 4 pixels , but they will all be identical to the starting pixel . No chance then of being recognized as a “bullet ” of the photo.

However, if the dot is not exactly small , and we are content with a reasonable magnification , anything you can do. Before proceeding further , we need to open a brief parenthesis to quickly recall some basic notions of digital graphics , which will prove useful when we are dealing with the operations of magnification. If you think you are already familiar with the topic, as well skip the next section and go to the heart of the article. Resolution and size is often said improperly ” this image has a resolution of 1600×1200 pixels .” In fact, those are the dimensions of the image. However, concerning dimensions , because they vary depending on how we decide whether big a pixel. The resolution of the pictures is indicated by the number of pixels that are in a given unit of measure. For example, a resolution of 300 DPI ( dots per inch or dots per inch ) indicates that in a thumb there are 300 pixels , as say 12 dots per millimeter.
Once you know the resolution and the pixel dimensions , we can calculate the actual size of the picture that will be printed once . Our photos from 1600×1200 points , for example, if printed at 300 dots per inch x4 measure about 5.3 inches – or about 17×10 cm .
To illustrate the methods to follow to zoom in on a detail of a photograph , let’s start with a very simple case : the photo of a flamingo in flight silhouetted against the sky. The subject was interesting, but the car we had on hand had a zoom very limited. Result , the sky and a white dot and pink in flight … However, the fact that the background of the picture there is uniform simplifies a lot of things : just cut out the area of ​​the photo that interests us, and the new frame is ready. Too bad that so the photo will not be more than three megapixels , as originally, but less than half , and its size when printed will be reduced proportionately, if we do not act on the controls (for example, changing the resolution) .
To return the picture to the desired size , we need to activate the resizing of our favorite photo editing program (in this case we used Adobe PhotoShop Elements) . Then movies on a single DVDactivate the Image Size dialog box ( Image menu , Image Size ) and proceed . We have two possibilities: if we want to enlarge the image to print it, we have to operate on the lower part of the window , the one with the heading ” Document Size ” . Under standard conditions (ie with the ” Constrain Proportions ” and enabled the ” Resample Image ” turned off, the three parameters of the section are connected to one another by raising the resolution , you reduce the size in print, while lowering it , the image will printed larger. Moreover, by acting directly on one of the dimensions (width or height) will vary in proportion to the other . All of these changes are not going to touch the pixels of the document , so much so that the top of the window remains unchanged . to zoom in actually the picture, creating new pixels , we need to enable the ” Resample Image ” .
At this point you unlock the pixel dimensions of the fields , and we can enter new values. A lesser number of pixels of the original cause a reduction of the size , a higher number will result in a magnification , with the creation of new pixels by the program . The trouble is that PhotoShop can not know which color they had , in fact, these pixels , and then uses mathematical techniques to “guess” the correct color based on the color of neighboring pixels . The techniques used by PhotoShop are three , but the best for pictures is one called ” Bicubic ” , in which the color of each new pixel is determined according to that of a group of pixels that are around . This method of calculation , the slower the linear method , it is more accurate and reduces the likelihood of ending up with blocks of pixels of uniform color, and therefore with a magnification absolutely not usable.
However, the methods to increase the size enlargement of PhotoShop , but not really introduce new detail : the original information of the scene that have been lost due to the limits of resolution of the camera can not be rebuilt . In practice , once activated the bicubic resampling and the option to maintain the aspect ratio , simply enter in the Width field the number of pixels you want to get the magnification of the image. Keep in mind that it is very difficult to enlarge an image beyond 120 , it should be noted that 130% without deterioration of quality.
In summary : if you need to magnify a part of the picture and there you have to take care of the background , cut out the part that you need, and Image Size ricampionatela to the desired width , of course, do not overdo it . So far, so easy. But now comes the fun part .

Effects & defects often happens that those “added” to a photograph have an unpleasant aura around it, due to the fact that the selection often brings with it the pixels belonging to the background of the subject ” clipped .” To cushion the defect , you can use the Feather Selection menu , which creates a softer transition between the selection and the background. If the cut-out portion must also be modified ( enlarged or distorted for example) can be useful to create a rectangular cutout around the subject , paste it into a new file , do the editing and only at the end of the run the same exact selection of the subject be bonded (always with the Feather Selection active) . This artifact montage are minimized .