I edited a bunch of JXR images in Photoshop and exported them as PNGs, now all the images I want to upload have incorrect timestamps (the edited date/time). Is there some software out there where I can just copy the timestamps from the JXR files to the PNG?
Alternativly all the images have a timestamp in the name e.g. 23_12_2021 17_35_49, any scripts that could make use of that?
Related
According to ebay documentation (https://developer.ebay.com/devzone/guides/features-guide/content/Development/pictures-intro.html), uploaded images must be in JPG, BMP, GIF, TIF, or PNG format, and that TIF, BMP and PNG files are converted to JPG.
When opening images of ebay items, they always open as jpgs with ".jpg" extension, however when you change the image extension at the end of URL from ".jpg" to ".png" the png image always gets produced, and the png files have better quality when doing visual comparison, futhermore gif images are also always produced when changing ".jpg" to ".gif" and I doubt that every seller is uploading their files in gif format. So I'm wondering what exactly is happening here, and my goal is to get the file in the best format, preferably original as uploaded by the seller.
I have a PDF file which is made of photographs of a book connected in a single PDF file. I'm trying to convert it back to single images in PNG format, every tool I tried asks me to set DPI which alters the size of resulting images, is there a way to get images of the exact same pixel size the original images were?
Most PDFs of books contain a single image per page and depending on the scanner these images can basically be in three different formats: JPEG, JPEG2000 or TIFF. JPEG2000 is rarely used, so your PDF probably contains JPEG and/or TIFF images.
The good thing about JPEG (and JPEG2000) images is that they can be embedded as-is into a PDF! So you can extract the images as they are stored in the PDF. With TIFF this is also sometimes possible (but I don't think always...).
As mentioned by Tim Roberts you should try using pdfimages or hexapdf images to view and extract the images stored in the PDF. This will give you the best result.
As we all know that jpg image format does not support transparency.
so we use .png format.
i was surfing on net and i found an image with .jpg format and
transparent. it is wonder how a jpg format image can be transparent.
here is the example image.
http://bdthemes.net/demo/joomla/intensy/images/sampledata/features/top_b.jpg
The provided example image is in fact not a JPEG, but a png file.
It has the extension and mime-type of a jpeg file, but it's contents are in png format.
JPEG file format does not support transparacy.
So if you need transparancy in images for use in browsers.
You can either:
convert the image to png, this works in all browsers
use ZorroSVG, requires SVG support but results in smaller files for photographic images.
use webp, only use when you have fallbacks in place for browsers that do not support webp.
The new JPEG-XR standard supports transparency.
However, this is not a real JPG, it's a PNG. If you rename it to .txt, you can see that the contents of the file start with PNG:
check its mime type, it must be renamed .png to .jpg
I searched the internet for the basic formats of image files (e.g. .jpg, .png, .gif) as there is a specific format for .doc, .pdf etc. But didn't got anything relevant. And today I also came with an .bin image format. BIN signifies that the image is in the Binary format. So, what is the Internal format of .jpg image file. And How is it different from .bin (Binary) format. Because everything is Basically saved in Binary Form. And How is BITMAP Image different from .jpg format.
if you open the files in notepad or change the jpg to .txt and a exe to .txt you will see the first X amount of bytes defines what type of file it is etc. I have never looked into where the "standard" is but as you will see all JPEGS start with a specific byte and EXE start with a specific byte no matter what the content
Also JPEG is a licensed compressed form of an image and BMP is Microsoft Windows version of an image(with little or no compression I believe. png is open source or GPL licensed and technically your files do not need to be "licensed" to convert to JPEG. This is the same as a .MP3 vs a.OGG in terms of music
New to Matlab, so sorry if this is a silly question. I'm filtering a series images for my research. I'm not having a problem with the actual image processing, it's when I go to save the modified images that I run into trouble. For some reason, I can only save the modified images using imwrite as .gif files. If I try to save them as .jpg, .bmp, etc., the file does not appear in the working folder. The corresponding generic file appears, but the actual .jpg does not. Additionally, when I use imread to reopen the midified files (that actually saved as .gifs), the image is just black. But, if I open the .gif file outside Matlab, it appears as expected. Code below.
close all
N=90;
IMAGES=cell(1,N); %creates a cell to store image data
FNAMEFMT='20110805115033(1)_%d.jpg';
for i=1:N
IMAGES{i}=imread(sprintf(FNAMEFMT,i)); %reads original images into IMAGES
end
RESULT=cell(1,N); %to store modified/filtered images
for i=1:N
gray=rgb2gray(IMAGES{i}); %converts to grayscale
binary=im2bw(gray,.5); %converts to bw
filter=bwareaopen(binary,35); %removes small features
RESULT{i}=filter; %saves modified image in RESULTS
end
for i=1:N
WRITEFMT='filter_%d';
imwrite(RESULT{i},sprintf(WRITEFMT,i),'gif'); %writes RESULTS as .gif
end
If I try to save them as .jpg, .bmp, etc., the file does not appear in the working folder.
You need to change
WRITEFMT='filter_%d';
to
WRITEFMT='filter_%d.jpg';
The files you are outputting are jpeg files (as per the imwrite argument 'jpg' instead of 'gif'), but they don't have a file extension. If you manually add the extension, they open as jpgs.
For the black gif, see if this helps.
Once you export as jpg, viewing them works
imshow(imread('filter_1.jpg'))