Saving a PNG 24 image...

Can someone tell me why Photoshop changes the physical size of my file when I save it as a png 24. And if you know can you tell me how to fix it? Thanks.

Thanks. The piece is a printed piece in the end. It has to be 300 dpi. What I create is the "frame" design and the background design. The consumer gets their picture taken in front of a green screen ( like in the movies) and then get placed in between the frame and background, giving the illusion that they are say... on the 50 yard line at the superbowl or something like that. In order for this to be achieved I have to save the files as 6x4 300dpi png 24s. The manufacturer of the software and printers require it.

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PNG images revive deleted images in the form of a thumbnail, potential risk

Saving a PNG image will revive deleted photos. To replicate this, save a PNG image, such as the ones on XKCD's "What If?", and deleted images get revived in the form of a thumbnail overlapping the image.
This has been here since IOS 5, according to http://appleinsider.com/articles/13/11/14/bug-resurrects-deleted-image-thumbnail s-in-ios-7-photos-app-dates-back-to-ios-5
Knowledge of this could be abused. If I get free acess to someone else's Ipad, I can just spam saving PNG images over and over to see their sensitive images saved as a thumbnail overlapping the PNG image's thumbnail.
How do I delete the thumbnails? It seems that when you delete a photo, it saves the thumbnail. This is supported by the PNG images reviving deleted photos in the form of thumbnails.

Send feedback/suggestions to Apple.
http://www.apple.com/feedback/ipad.html
Submitting Feedback to Apple
https://sites.google.com/site/appleclubfhs/support/advice-and-articles/submittin g-feedback-to-apple
File an Apple Bug Report, at http://bugreport.apple.com/
 Cheers, Tom

Saving same png file gives me image with 10x smaller size

Hi.
I would appriciate if someone explained me what I'm doing wrong.
I have a png image, of 256x128 size. It has 8bits per pixel for color. Now this image's size is 97kB. I open it in photoshop, I save it as different png file, and then... this image is 7kB of size.
Can someone tell me what's wrong, or what I'm doing wrong?
Lucas

Ok guys, thanks a lot for patience. Below is the main cause why I started this topic, but I still can't figure it out. I thought the loss of size is the cause, but you say it's not :/
I'm not that skilled as you guys, so that's the primary reason why I'm here. I will be really gratefull if someone could give me a hint here, or some small help.
To cut to the chase, I'm trying to use a program that creates graphics for older games. This program edits particular files, that have different resolutions and different number of bits per pixel. The problem I have however is the transparency and color palette, as I never had dealings with that. The problem is, that someone created before a pictures that are very smooth, and this seems to be the cause of very smart using of transparency levels, for different colors in the palete. However, I have no idea how to achieve the same effect, I tried many things, but still can't figure this out. I will try to ilustrate the problem below.
Below is a screenshot from this application
[img]http://img21.imageshack.us/img21/5396/41135434.png[/img]
On the right is the picture that is the root of my question here. It has to be in the format with palette of collors in amount of 16, although I have no idea where it stores the alpha channel information, as there are 4 bits for color per pixel. Well anyways, you can see on the right top corner the palette. It basicaly has only the shades of gray in this case. I can switch now to the alpha channel mask, and this is what I get:
[img]http://img29.imageshack.us/img29/4089/69176653.png/img]
You can see that each of the colors in the palette has different alpha values. Now what I tried is, I exported the image, I opened it with photoshop, saved it, imported it in the program, and guess what I found in the alpha channel mask:
[img]http://img821.imageshack.us/img821/7104/51957014.png[/img]
All the information of the alpha channel for each color is gone!
Here are the examples with more colors(256):
[img]http://img853.imageshack.us/img853/2108/84834785.png[/img]
The alpha channel mask
[img]http://img718.imageshack.us/img718/4944/25526459.png[/img]
And now, I do the same as before, export it, save it in photoshop, and guess what, all the info is gone again:
[img]http://img577.imageshack.us/img577/8991/50003321.png[/img]
Now loosing this information is not a problem, as I will be inputting different pictures, but my question is, how I can achieve the same effect in photoshop for my images that I will try to import. I would love to have as smooth edges as they are seen on those examples above.

Saving png images at 72 pixels resolution

Hi,
I have been creating images for our Flash designer, saving them in Fireworks as png images. We recently discovered that they are being saved at 71.89 pixles resolution, while in the Flash they need to be 72 pixels. To solve this problem the designer has to open the pngs in Photoshop and resave them as a png, which is a problem.
Is this difference in resolution due to both PhotoShop and Fireworks being different products and originally from different companys, or due to me working on a PC and our Flash designer working on a Mac.
Can I set Fireworks to save pngs by default at 72 pixles resolution so any further images I create work in our Flash movie?
Stephen

Hi,
I've just found out that the Flash designer is using Virtual Desktop on their mac, and doing their development in the virtual pc enviroment. Not sure if the Mac way of interpreting image resolutions is 'passed' to the virtual PC? My Fireworks is set up as 72 pixels/inches as the resolution so I think the mac/pc differences is still the cause of the problems.
Thanks
Stephen

Whenever I have a png image as the last saved filed in my camera roll, it overlaps a picture I've deleted a long time ago. What?

Just as the title said. iPod touch 4th generation, 4.3.5, not jailbroken. Different png images have different, but specific to each image, pictures that they overlap. Could this be automatic inaccessable-file storing on that confusing extra space? I don't know. I just want them off there.

...In the meantime...
If you can get one of these faulty pictures to display on your iPod Touch (that you don't mind sharing with us) take a screenshot of it. You may already know this, but to take a screenshot on your iPod Touch, press the Sleep/Wake button and the Home button at the same time. The screen should briefly flash white and a picture should be saved in the camera roll.
To post that picture on this thread, once you have saved the picture onto your computer, simply click the camera icon at the menu bar that displays when you write a post and follow the prompt:
and then perhaps someone may be able to throw some light on what's happening.
Do you delete the pictures directly from the Camera Roll, or by using the file manager on your computer? I wonder if it's possible that a delete-on-iPod may not be doing the job properly.
Usually, when I Sync my iPod, I delete the Camera Roll from the iPod using the computer.
I have not seen any other posts on this issue, so I don't know if that's the problem, but at this time, I think you simply have to narrow down when and under what circumstances, this happens. Only then could anyone work out what the cause is.
If I may offer you some advice of a personal nature for your future benefit:
You're correct, I don't know the exact circumstances surrounding this or the other factors in your life, but neither I, nor anyone else here needs to. But the fact that you're able to afford - and have access to - an iPod makes your life better than many in the world.
If you're seeking help or advice, in any sphere of your life, it's far more efficient to concentrate on the facts relevant to the issue than to attempt include into your narrative, any perceived slighting you may harbour or grievance you may have with other people. If you allow one person's effect on you to affect your judgemnent of other people, you will only make your own life more intolerable.

Saving flash drawing as png image to database

Hey guys and girls,
i've seen a few good examples to save out a png of the current flash display area from a webbrowser from a flash, such as:
http://www.adobe.com/devnet/flash/articles/saving_flash_graphics.html
http://activeden.net/item/logo-maker-image-editor/99565
http://www.flepstudio.org/forum/tutorials/507-swf-png-actionscript-3-0-bytearray-class.htm l
what they normally do is stream the image data through a png encoder to a web server somewhere and then decode the image data back to current webbrowser and then trigger the web browser SAVE function, by prompting user to select a path and file name to save, like a download.
What I’m trying to do is very similar, however, the difference is when you click that save button, you can save your png image directly to a certain location with a fixed file name, such as on your local computer:
D:\flashimage\001.png
or on a file server: 10.21.111.111\flash_image\001.png
so i cant find the syntax here. can anyone give me some hints on this? thanks ahead!

the user.
Thanks for replying.

Firefox asks what to do with some PNG images instead of just displaying them

Not sure what is going on here, but some PNG images seem to confuse Firefox, while others are fine. While some PNGs just display when clicked on (eg: when wanting to see a full size image from a thumbnail), others make Firefox ask what I want to do with it. When I select "Firefox 3.6.8" it ends with an error:
/tmp/elementary_gtk_theme_by_DanRabbit-1.png could not be opened, because an unknown error occurred.
Try saving to disk first and then opening the file.
... but when I manually made it open with "/usr/bin/firefox" (I'm in Ubuntu) the image opens fine. I was beginning to think this was now universal for PNGs, but I was opening offending ones from the same site, and going elsewhere showed that some PNGs will be displayed as usual. Does anyone have any idea why this would happen to some PNGs but not all? Here is a link to one of the problem PNGs:
http://s.linux-mag.com/i/articles/7811/elementary_gtk_theme_by_DanRabbit.png
It opens without issue in Opera. Hope someone can make sense of this. Cheers

You can look at this extension:
*Open in Browser: https://addons.mozilla.org/firefox/addon/8207

Producing a line graph of int values and saving as an image

Hi,
I wonder if anyone could help me with this. I have 2 arrays of integer values that I would like to plot as a line graph (e.g. X[ ] and Y [ ]) and then have this line graph saved as an image (the format isn't too important but PNG would be preferred).
Could somone point me in the right direction of an easy way to do this?
Thanks,
Pete

Have a look at the following classes :
java.awt.Graphics (drawLine method)
java.awt.Image
java.awt.BufferedImage
javax.imageio.ImageIO (jdk 1.4+)

Removing background shadow on transparent PNG image without losing shading on the object?

I have a pillow bevel applied to a paint splatter brush image, and I'm having trouble with the shadows. I want to save this splatter as a transparent PNG. The problem is that a drop shadow effect is showing up when I save it this way. I think it's a "shading" setting rather than a true drop shadow, as there is no drop shadow set in the layer styles. The shadow does not appear when a white background is applied. It only shows when the background is transparent. I've tried reducing the shading opacity in the bevel dialogue, and this does get rid of the drop shadow....the problem is that it also removes the shading from the paint splatter, making the image look flat instead of raised. Can anyone help? Thanks!

Good point Curt. First time poster, so I wasn't sure how to include images in my original post. Here they are:
Above is the image saved WITH transparency. Obviously the shadows all around the blue make this unusable.
Here is the exact same image...the only difference is that I saved it with a white background layer behind it in photoshop. As you can see, the shadow artifacts are gone, yet the splatter still maintains its correct shading to keep the raised effect.
Both of these images are saved as png. Any suggestions?

How to convert 24bits png image into 8 bits image

Hi,
I have gone through some of threads in this forum on changing color bits. But, I still can find right way to change my image (24bits) into different color bits(8 bits). The reason i want to change the color bits because I am getting a GIF image from map server, convert it into PNG format then rescale then into size of mobile phone screen.The PNG image is really has large data length , so the it took a while to load the whole image on screen.
Note : The following code is taken from few threads in this forum and i have modified it to suit my application.
I have no idea about Java2d...any help really appreciated...Thanks in advance!!!
My code is as follow:-
public File Scale(int width, int height, BufferedImage ImgSrc)
     try
               //BufferedImage bi = ImageIO.read(ImgSrc);
               //int w = bi.getWidth(), h = bi.getHeight();
     //Image oldRescale = bi.getScaledInstance(i, j, Image.SCALE_SMOOTH);
     BufferedImage Rescale = rescale(ImgSrc, width, height);
               //ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_GRAY);
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     File outfile = new File("map.png");
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               ColorModel cm = fromFile.getColorModel();
               System.out.println(cm.getClass() + ", bits/pixel=" + cm.getPixelSize());
          catch(Exception e)
               e.printStackTrace();
          return new File("map.png");
     public static GraphicsConfiguration getDefaultConfiguration()
GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice gd = ge.getDefaultScreenDevice();
return gd.getDefaultConfiguration();
     public static BufferedImage copyRescaled(BufferedImage tgt, BufferedImage src)
          Graphics2D g2 = tgt.createGraphics();
int w=tgt.getWidth(), h=tgt.getHeight();
hintForBestQuality(g2);
     g2.drawImage(src, 0, 0, w, h, null);
     g2.dispose();
return tgt;
public static Graphics2D hintForBestQuality(Graphics2D g2)
g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
          RenderingHints.VALUE_INTERPOLATION_BILINEAR);
g2.setRenderingHint(RenderingHints.KEY_RENDERING,
          RenderingHints.VALUE_RENDER_QUALITY);
return g2;
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int transparency = src.getColorModel().getTransparency();
GraphicsConfiguration gc = getDefaultConfiguration();
BufferedImage tgt = gc.createCompatibleImage(w, h, transparency);
return copyRescaled(tgt, src);

First, we need to be clear about what you're trying to do -- is it rescale an
image or insure that the image is saved with a 8bit pixel depth? Or both? You are also
using GraphicsConfiguration's createCompatibleImage, which is excellent if you are going
to display the image immediately because it might be hardware accelerated
or compatible with hardware format, but you mentioned mobile phone screens, so
there is no advantage to using GraphicsConfiguration in that case, and if fact, it's
probably changing your ColorModel when you're not looking.
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.awt.image.*;
import java.io.*;
import java.net.*;
import javax.imageio.*;
import javax.swing.*;
public class Example {
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        System.out.println("image's colormodel = " + image.getColorModel().getClass());
        BufferedImage rescaled = scaleAndConvertColorModel(image, 0.75, null); //GIF => IndexColorModel
        System.out.println("rescaled's colormodel = " + image.getColorModel().getClass());
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        ImageIO.write(rescaled, "png", png);
        BufferedImage fromFile = ImageIO.read(png);
        System.out.println("fromFile's colormodel = " + image.getColorModel().getClass());
        JPanel cp = new JPanel(new GridLayout(0,1));
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        addTo(cp, rescaled, "rescaled image");
        addTo(cp, fromFile, "png file image");
        JFrame f = new JFrame("Example");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setContentPane(cp);
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
        Will rescale and convert colormodel if necessary.
        ColorModel == null => don't convert. May return src if suitable.
    public static BufferedImage scaleAndConvertColorModel(BufferedImage src, double scale, ColorModel cm) {
        int w0 = src.getWidth();
        int h0 = src.getHeight();
        int w = (int) (w0 * scale);
        int h = (int) (h0 * scale);
        ColorModel cm0 = src.getColorModel();
        if (cm == null)
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            return src;
        BufferedImage tgt = createImage(w, h, cm);
        Graphics2D g = tgt.createGraphics();
        if (scale < 1) {
            Image temp = src.getScaledInstance(w, h, Image.SCALE_AREA_AVERAGING);
            g.drawImage(temp, null, null);
        } else {
            hintForBestQuality(g);
            g.drawRenderedImage(src, AffineTransform.getScaleInstance(scale, scale));
        g.dispose();
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    public static BufferedImage createImage(int w, int h, ColorModel cm) {
        if (w <= 0 || h <= 0)
            throw new IllegalArgumentException("...");
        boolean alphaPremultiplied = cm.isAlphaPremultiplied();
        WritableRaster raster = cm.createCompatibleWritableRaster(w, h);
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        g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);
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How do I get picture control to display PNG images with transparent background?

I have an image of a robot arm looking from the top with a transparent background and saved as PNG. When I drag the image directly to LabVIEW front panel, the image shows properly with the transparent background, but I want to manipulate it such as rotate the image. I used the Read from PNG.vi to read the image to a picture control, but the background isn't transparent anymore. Am I missing something?
Please help.

unclebump gets 5 stars for referring you to a document that I wrote.
Incidentally, I wrote it years back, for LabVIEW 7.0. A couple of notes to summarize:
The picture control doesn't "really" support transparency. However, the image data type supports masking, and stores the alpha channel, if present in your image data. So you use the "Create Mask By Alpha.vi" referenced in that document to mask out pixels whose transparency is above a certain level. It does not support partial transparency. You could try to implement your own blending algorithm based on the picture control's current pixel values, and the image data's RGB value and transparency value, but it would probably be very slow.
Also, that VI ships with 8.0 and later. I don't know if it's on the palettes but it lives here: vi.lib\picture\picture.llb\Create Mask By Alpha.vi
Good luck!

Problem with CFimage / PNG images

I have a problem saving PNG images from another server, for example itunes, some work, some don't
The following image will open fine in my browser ->
http://a576.phobos.apple.com/us/r30/Purple/v4/de/60/bb/de60bb7f-8995-4007-cfec-1b0a472fa36 7/icon.png
This is the error I am receiving:
An exception occurred while trying to read the image.
javax.imageio.IIOException: Error reading PNG metadata
Code:
<cfimage source="http://a576.phobos.apple.com/us/r30/Purple/v4/de/60/bb/de60bb7f-8995-4007-cfec-1b0a472fa36 7/icon.png" overwrite="true" destination="#filepath#/9999.png"
action = "write">
I believe some images have malformed/incorrect headers. I'm guessing this is a CF issue (I use CF8), because it loads fine in a browser.
Anybody have a solution to this? Maybe an alternative way to retrieve the image? Custom tag?
Thanks
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I found the issue and solution. The problem was with the Java, the JVM had issues reading SOME PNG's from servers, but not all, there must be a newer way of encoding them that was not around when the version of java I had was created, or it's just a bug. I had an earlier version of 1.6 which is downloaded as version SE 6 from Oracle.
As per some instructions by Ben Forta I tried an update of the JVM to version 7 (1.7.x),
http://forta.com/blog/index.cfm/2013/3/3/Upgrading-ColdFusion-To-Java-7
The update worked on my local dev machine which was CF8 with Win 7 64bit, and it actually fixed the CFIMAGE issue!
However, when I did the same update, with the same java file on the same version of CF8, CF would no longer restart throwing an error that it could not find a file.
Luckily I had a backup of the config file because I could not switch settings back any other way if CF would not start the administrator (Java also makes a .BAK anyway)
I tried the first build of version 7, same problem, so I went to the very last version 6, build 45, it installed, and it also fixed the CFIMAGE crash!
A couple of points for anybody else trying this
Make sure you have a back up the config, in CF8 it's located here (different to the location in Bens instructions)
Coldfusion8\runtime\bin\jvm.config
Also note that the forward and backward slashes are different for the built in JVM that ships with CF and is set in the administrator, and the location you will specify
Original location: C:/ColdFusion8/runtime/jre
New location: C:\Program Files\Java\jre7\
Here is the location to the Java file (
Java SE Runtime Environment 6u45)
Java Archive Downloads - Java SE 6
Took me days to get to the bottom of this, but the fix actually takes just a few simple steps and a few minutes, of course
Mark

"I an creating a imagen using hue,sat and lum.I want to uses it as pattern,but i can´t to saved as png.Is it posible?"

I think to create a ideal pattern with specific values of hue,sat,and lum.I create a VI, and i can to see diferent images when change the hue and saturation,but it can´t be saved as png,etc, with a error"invalid image"
Attachments:
patrondinamyc1.vi ‏92 KB

HSL images can only be saved in the AIPD format. Please see the IMAQ Vision Concepts Manual or the LabVIEW help page for IMAQ Write File for more details. To save the image to another file format, you could convert it to RGB and then convert back to HSL when you are going to use the image later.
Regards,
Brent R.
Applications Engineer
National Instruments

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Saving JPGs & PNGs from Photoshop CC is creating what I can only describe as a obscene file bloat. Just recently, what should have been a 7k jpg saved as a 1.1 mb jpg file. PNGs which should average roughly 100-150k are coming out at 1.3mb. If I use the "Save for Web", sometimes it gives me the proper sized images.
I have noticed this on 2 computers --- one a mac & one windows with completely different file sets. So it is not an issue of my OS, the original files or anything specific to one particular common item.
FYI -- Doing the same thing with pshop cs6, I get the proper file sizes.
I have included a sample image here. This image is a straight out "save" from pshop CC -- it is 1.1mb. However, when I saved the same image as a JPG in pshop cs6, it was 7k.
Is anyone else experiencing this issue?

Haven't had a PNG or JPG go wacky here in that way so far...
I think the issue is revealed by looking in File - File Info in the Raw Data section. I don't know why, but there are a huge number of <rdf:li> XML elements showing up there with hex values in them. I don't know what that means, exactly, but I believe the accumulation of that metadata explains the size increase.
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-Noel

Problem with reduction Of an PNG Image with transparent background

I have an PNG Image on my computer with a transparent background that I would like to reduce 50% and save it back to my computer can you tell me how to achive this?

Are you looking to reduce the size (pixel dimensions) by 50% or reduce the file size by 50%?
If you want to reduce the actual image size (pixel dimensions) you could go to Image>Image Size
and check resample image with constrain proportions and then enter 50 in the pixel dimensions at the top after setting
the drop-down to percent.
Or use file Save for Web and enter 50 under the percent under image size.
As far as saving you could use File>Save As in photoshop and choose png or File>Save for Web>png
(save for web usually results in smaller file sizes)

Resizing .png images

Hi,
I have many .png images in several files and I am unable to resize them using the resizing tool (click & drag to resize). Does anyone have another way to resize these images, besides opening them and saving them in the correct size? Some images are used in several places and while one image size works in one file, it does not work in another. I'm afraid I'm going to have to maintain duplicate images.
I thought about saving the .png file into a different format, but that degrades the image some.....
thanks for your ideas.....!
RH 8.0.2

I generally work with jpg and gif formats so I was rather surprised to see the Resizer does not list PNGs as a supported format. Have you tried GIF format? It will depend on what the images are but screenshots seem to resize OK within limits.
Please follow this link and submit PNG resizing as a feature request.
http://www.Adobe.com/cfusion/mmform/index.cfm?name=wishform&product=38
See www.grainge.org for RoboHelp and Authoring tips
@petergrainge

Saving a PNG 24 image...

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