How to convert a TGA or EXR image to PNG on a Mac

TGA and EXR are specialist image formats that most Mac apps will not open, so converting them to PNG makes them viewable and shareable everywhere. The fast way is to drag the file onto Manatee, choose Convert, and pick PNG; a new .png lands beside the original. The two formats behave very differently in the conversion, though: a TGA moves to PNG almost perfectly, while an EXR has to give up the extra range that made it special, and this post explains both.

What TGA and EXR actually are

TGA, short for Truevision Targa, is an old image format that has hung around in games and 3D work for decades, often as a texture or a rendered frame. It stores ordinary 8-bit-per-channel pixels and can include an alpha channel for transparency. In other words, it holds the same kind of image data as a PNG; it is just wrapped in a format that modern Mac apps rarely recognize.

EXR, the OpenEXR format, is a different animal. It comes from visual effects and 3D rendering and is built to store high dynamic range images in floating-point values. Where a normal image pins brightness between black and white, an EXR can record values far beyond what a screen can show, so a bright window or a highlight keeps real detail that can be pulled back later. It is a working format for compositing and grading, not a format for viewing on a phone or dropping into a document.

PNG, by contrast, is the universal, lossless, standard-range image format. Everything opens it, it keeps every pixel exactly, and it supports transparency. That is why it is the sensible destination for both.

Converting a TGA to PNG: a clean move

Going from TGA to PNG is about as simple as image conversion gets. Both formats store integer pixels in the same standard range, and both are lossless, so the pixels come across exactly. If the TGA has an alpha channel, PNG supports transparency too, so that comes along as well. There is no dynamic range to reduce and no lossy compression involved; the picture you see afterward is the same picture, now in a format every app understands.

The only real change is compatibility. A TGA that Preview or a web page would not touch becomes a PNG that opens anywhere, with no visible difference and nothing lost. This is the easy case, and there is little to think about beyond doing it.

Converting an EXR to PNG: where the range goes

EXR to PNG is the conversion that needs care, because you are stepping down from a high dynamic range, floating-point image to a standard, fixed-range one. PNG cannot hold values brighter than white or the fine floating-point gradations an EXR keeps. So the conversion has to map that wide range into the normal zero-to-full scale a screen displays, and anything that sat beyond the visible range gets clipped or compressed to fit.

The practical consequence is that the PNG is a viewable snapshot of the EXR, not a substitute for it. Highlights that the EXR stored in full, ready to be pulled back down in a grade, are simply gone once they are clipped into PNG. The ability to re-expose the image or recover a blown-out sky, the entire reason to work in EXR, does not survive the trip. That is completely fine when your goal is to look at the render, post it, or drop it into a document. It is not fine if the EXR is still a working file you intend to composite or grade, in which case you should keep the EXR and treat the PNG only as a preview. As always, Manatee writes the PNG as a new copy and never alters the EXR, so keeping both is the safe default.

One more note: because a screen only shows standard range anyway, a straightforward EXR-to-PNG conversion gives you the image as it looks with no special grading applied. If the render depended on tone mapping to look its best, the PNG shows the untuned version, which is another reason to keep the EXR for any serious finishing work.

How to convert on a Mac

With Manatee, both formats go the same way:

1. Open Manatee and choose Convert, or drag the file onto the Manatee icon in the menu bar.
2. Pick PNG as the target.
3. Drop in a single TGA or EXR, or a whole folder of rendered frames. Each file appears in the job list with its progress.
4. The new .png is written next to the original, which is left untouched.

Everything runs on your Mac, with no upload and no account, which is handy for large render frames you would rather not send anywhere.

The built-in options are patchier here than with common formats. Preview and QuickLook can often open and export a TGA, so for a single Targa the system may be all you need. EXR support in macOS is inconsistent across versions and apps: sometimes a preview appears, sometimes it does not, and even when it does you have little control over how the wide range is mapped down. When you have a folder of frames, or an EXR that nothing on the Mac will open cleanly, dropping the files into Manatee and letting the job list run is the dependable route.

Questions

Will converting a TGA to PNG lose any quality?

No. Both formats store the same kind of standard-range pixels and both are lossless, so the image comes across exactly, transparency included. The only thing that changes is that the PNG opens in apps the TGA would not.

Why does my EXR look flat or washed out as a PNG?

Because the EXR held a high dynamic range that PNG cannot store, so the conversion mapped that range down to what a screen shows. Detail beyond the visible range was clipped. The PNG is a viewable snapshot; if you need the full range back, work from the original EXR, which Manatee leaves untouched.

Can I get the highlight detail back from the PNG later?

No. Once the extra range is clipped into a standard PNG, that information is gone, the same way a rescued-highlight edit is impossible after the fact. Keep the EXR if there is any chance you will grade or composite the image; use the PNG only for viewing and sharing.

Can I convert a whole folder of rendered frames at once?

Yes. Drop the folder onto Manatee’s window and every TGA or EXR joins the job list with its own progress, each written out as a separate PNG beside its original. This is the main advantage over the Mac’s built-in tools, which handle one file at a time.