Jpeg is a form of compression used to store image data. Photo compression is a technique used by cameras, phones & social media.
This is a method of reducing the data within the image in order to reduce the file size. With compression techniques, the number of pixels may remain the same, however the quality of the pixel date can become extremely compromised. An image that requires 5 or 10Mb of storage space can keep the same number of pixels and yet when compressed, needs only 1 or 2Mb of storage space on your computer or camera. Its not rocket science to guess what sort of affect this will have on the quality of your photo.
There are two basic things which become compromised; colour and the quality of the pixels. By reducing the number of colours contained within an image, there is much less data to be kept. For instance a black and white image containing the same number of pixels as a colour image will require about 25% of the data. This affect may not be noticeable when viewed on a screen but is very evident when printed.
For colour images, compression means that many of the subtle nuances of colour are lost, making your photo appear flat and lifeless.
The second result is the quality of the pixels, making the lines and detail of your photo become jagged and less distinct. Trees and grass become blobs of colour rather than individual elements. The amount of damage that is done to an image varies depending on the level of compression and the amount of file size that is reduced from the original.
Compression comes in many levels, from high quality that will barely damage the photo and is still suitable for print to heavy compression (often used by websites and social media), which removes most of the detail and colour from a photo. For this reason, we also suggest that you upload the original file from your phone or cameras. For best results, you should always print from photos as they were taken, unadjusted and uncompressed. We will always endeavour to ensure that your images are printed at their best, even if we need to lighten some of the darker areas or brighten the overall image.
What is noise in photography?
Noise is the bane of all photos taken in limited lighting conditions.
Often, when you view a photo of a night-time sky full of stars, all you see is a wave of tiny dots containing red, green and blue. This is known as ‘noise’ and is inherent in all digital photography where the lighting is limited. Basically, the colours of the image break apart into tiny dots whilst the camera struggles to find enough light to render the image. Essentially there is nothing that can be done to prevent this from happening to some degree.
Professional photographers use various techniques to reduce the level of noise although this is a complicated methodology and requires knowledge and experience.
Beautiful sunsets, will always be stunning as printed posters.
Do not be deterred from printing those amazing evening images of sunsets or sunrise. We use noise reduction software where possible when printing dark images. This slightly reduces the effect, however, most dark prints when viewed are not destroyed by the appearance of some noise. The overall view of a stunning sunset over sea or landscape is still beautiful to behold.
For those of you with digital SLR cameras, all of the above three points get far more complicated. The quality of your digital chip, coupled with resolution, lens quality, and camera software add an even greater degree of variation to the results of your photography.
In summary, there is no hard and fast rule as to how many pixels are required to print a particular size.
We therefore do not use any software on our website which states how many pixels are required for each size of print. Instead we rely on our personal knowledge and experience. We check each uploaded photo before printing.
If necessary, we will contact you to request if you may have a larger original file.
However, always remember, it is always advantageous to upload the best file you have available. That way you can be assured that your photo poster prints is the highest quality possible, giving you beautiful decor for years to come.
Never fear, today’s digital devices take amazing pictures for print.
Whatever your image, at Poster Print Co, we will always ensure that your prints are the best they can be!