Skyrius 6. Getting Images out of GIMP


1. Failai
1.1. Save / Export Images
1.2. File Formats
2. Paveikslėlių paruošimas žiniatinkliui
2.1. Optimalaus dydžio ir kokybės santykio paveikslėliai
2.2. Dar didesnis failo dydžio sumažinimas
2.3. Paveikslėlių su permatomumu išsaugojimas

1. Failai

GIMP is capable of reading and writing a large variety of graphics file formats. With the exception of GIMP's native XCF file format, file handling is done by plug-ins. This makes it relatively easy to extend GIMP to support new file types when the need arises.

1.1. Save / Export Images

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When you opened an image in older GIMP releases, let's say a JPG or PNG, the image kept its format and was saved in the same format by using Save. Since GIMP 2.8, all images are imported into GIMP's own XCF format, as a new project.

For example, a sunflower.png image will be loaded as *[sunflower] (imported)-1.0 (indexed color, 1 layer). The leading asterisk indicates that this file has been changed. This image can be saved as sunflower.xcf by using the Save command. If you need your image in another format, you should use the Export command.

When you are finished working with an image, you will save the results. In fact, it is often a good idea to save at intermediate stages too. GIMP is a pretty robust program, but on rare occasions crashes have happened.

GIMP's native format XCF is special. It is the only format that can store everything about an image (with the exception of undo information). This is the reason that saving can only be done in this format. It makes the XCF format especially suited for storing intermediate results, and for saving images to be re-opened later in GIMP.

XCF files are not readable by most other programs that display images. Once you have finished editing your image, you can export it to the format of your choice. GIMP supports a wide range of formats. Most file formats that can be imported, can also be used for exporting.

1.2. File Formats

There are several commands for saving and exporting images. They are listed in the section covering the File Menu. More information on how to use them can be found there.

GIMP allows you to export the images you create in a wide variety of formats. It is important to realize that the only format capable of saving all of the information in an image, including layers, transparency, etc., is GIMP's native XCF format. Every other format preserves some image properties and loses others. It is up to you to understand the capabilities of the format you choose.

Exporting an image does not modify the image itself, so you do not lose anything by exporting. See Export file.

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When you close an image (possibly by quitting GIMP), you are warned if the image is "dirty"; that is, if it has been changed without subsequently being saved (an asterisk is in front of the image name).

Pav. 6.1. Closing warning

Closing warning

Saving an image in GIMP's native format XCF will cause the image to be considered "not dirty". On the contrary, exporting an image will not change it to "not dirty", because GIMP can't know for sure that no image information will be lost.

1.2.1. Export Image as GIF

Pav. 6.2. The GIF Export dialog

The GIF Export dialog

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The GIF file format does not support some basic image properties such as print resolution. If you care for these properties, use a different file format like PNG.

GIF parinktys

Checking interlace allows an image on a web page to be progressively displayed as it is downloaded. Progressive image display is useful with slow connection speeds, because you can stop an image that is of no interest; interlace is of less use today with our faster connection speeds.

GIF komentaras

GIF comments support only 7-bit ASCII characters. If you use a character outside the 7-bit ASCII set, GIMP will export the image without a comment, and then inform you that the comment was not saved.

Animuotų GIF parinktys
Amžinas ciklas

When this option is checked, the animation will play repeatedly until you stop it.

Delay between frames where unspecified

You can set the delay, in milliseconds, between frames if it has not been set before. In this case, you can modify every delay in the Layer Dialog.

Frame disposal where unspecified

Jei tai nebuvo nustatyta anksčiau, galite nurodyti kaip kadrai bus uždėti vienas ant kito. Galite pasirinkti iš šių parinkčių:

  • I don't care: you can use this option if all your layers are opaque. Layers will overwrite what is beneath.

  • Cumulative Layers (combine): previous frames will not be deleted when a new one is displayed.

  • One frame per layer (replace): previous frames will be deleted before displaying a new frame.

Use delay entered above for all frames


Use disposal entered above for all frames


1.2.2. Export Image as HEIF/HEIC

HEIF stands for High Efficiency Image File Format. Also known as HEIC High Efficiency Image Coding.

Twice as much information can be stored in a HEIF image as in a JPEG image of the same size, resulting in a better quality. As of October 2019, no browser supports HEIF natively.

More information in Wikipedia.

Pav. 6.3. The HEIF/HEIC Export dialog

The HEIF/HEIC Export dialog

These options are self-explanatory.

1.2.3. Export Image as JPEG

JPEG files usually have an extension .jpg, .JPG, or .jpeg. It is a very widely used format, because it compresses images very efficiently, while minimizing the loss of image quality. No other format comes close to achieving the same level of compression. It does not, however, support transparency or multiple layers.

Pav. 6.4. The JPEG Export dialog

The JPEG Export dialog

JPEG algoritmas yra gana sudėtingas ir turi gluminančiai daug parinkčių, kurių reikšmė yra už šios dokumentacijos apimties. Jei nesate JPEG ekspertas, jums tikriausiai reikės koreguoti tik Kokybės parametrą.


Kai išsaugote failą JPEG formatu, rodomas dialogas, leidžiantis nustatyti Kokybės lygį, nuo 0 iki 100. Tačiau reikšmės virš 95 paprastai yra nenaudingos. Numatytoji kokybės reikšmė 85 dažniausiai duoda gerus rezultatus, tačiau daugeliu atvejų kokybę galima nustatyti žymiai mažesnę, pastebimai nesumažinant paveikslėlio išvaizdos. Galite išbandyti skirtingų kokybės parametrų poveikį, JPEG dialoge pažymėdami parinktį Paveikslėlio lange rodyti peržiūrą. Pažymėjus šią parinktį kiekvienas kokybės (arba bet kurio kito JPEG parametro) pakitimas bus rodomas paveikslėlio ekrane. ( Tačiau tai nepakeičia paveikslėlio: uždarius JPEG dialogą, jis grąžinamas į pradinę būklę).

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Please note, that the numbers for the JPEG quality level have a different meaning in different applications. Saving with a quality level of 80 in GIMP is not necessarily comparable with saving with a quality level of 80 in a different application.

Naudoti originalaus paveikslėlio kokybės parametrus

If a particular quality setting (or quantization table) was attached to the image when it was loaded, then this option allows you to use them instead of the standard ones.

Jei paveikslėlyje padarėte tik kelis pakeitimus, naudodami tuos pačius kokybės parametrus gausite beveik tokią pačią kokybę ir tokį pat failo dydį kaip originalaus paveikslėlio. Tai sumažins kvantizacijos sukeliamus kokybės praradimus, kurie atsitiktų naudojant kitus kokybės parametrus.

Jei originalaus failo kokybės parametrai yra ne geresni nei jūsų numatytieji kokybės parametrai, tuomet parinktis Naudoti originalaus paveikslėlio kokybės parametrus bus prieinama, tačiau neįjungta. Taip užtikrinama, kad visada gautumėte bent mažiausią jūsų numatytuose parametruose nurodytą kokybę. Jei paveikslėlyje nepadarėte didelių pakeitimų ir norite jį išsaugoti, naudojant tokią pačią kokybę kaip ir originale, tai galite padaryti įjungdami šią parinktį.

Show preview in image window

Checking this option causes each change in quality (or any other JPEG parameter) to be shown in the image display. (This does not alter the image: the image reverts back to its original state when the JPEG dialog is closed.)

Keep metadata

If the image you loaded has Exif, XMP, IPTC metadata, they are preserved, and you can keep them or not when exporting to JPEG.

Save thumbnail, Save color profile

Many applications use the small thumbnail image as a quickly available small preview image.


You can edit the comment attached to the image you loaded or write a new one.

Advanced Options

Informacija apie sudėtingesnius parametrus:


If you enable this option, the optimization of entropy encoding parameters will be used. The result is typically a smaller file, but it takes more time to generate.


JPG compression creates artifacts. By using this option, you can smooth the image when saving, reducing them. But your image becomes somewhat blurred.

Use arithmetic coding

Arithmetic encoding is a form of entropy encoding (a lossless data compression scheme) that, since GIMP-2.10 can be used in exporting as JPEG. Images using arithmetic encoding can be 5 - 10 % smaller. But older software may have trouble opening these images.

Use restart markers

The image file can include markers which allow the image to be loaded as segments. If a connection is broken while loading the image in a web page, loading can resume from the next marker.

Interval (MCU rows)

JPEG images are stored as a series of compressed square tiles named MCU (Minimum Coding Unit). You can set the size of these tiles (in pixels).


With this option enabled, the image chunks are stored in the file in an order that allows progressive image refinement during a slow connection web download. The progressive option for JPG has the same purpose as the interlace option for GIF. Unfortunately, the progressive option produces slightly larger JPG files (than without the progressive option).

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Beware that certain older TVs and photo frames (and maybe other devices) may not be able to show jpeg images that have been exported with the progressive setting enabled (which is the default).


The human eye is not sensitive in the same way over the entire color spectrum. The compression can use this to treat slightly different colors that the eye perceives as very close, as identical colors. Three methods are available :

  • 1x1,1x1,1x1 (best quality): Commonly referred to as (4:4:4), this produces the best quality, preserving borders and contrasting colors, but compression is less.

  • 2x1,1x1,1x1 (4:2:2): This is the standard subsampling, which usually provides a good ratio between image quality and file size. There are situations, however, in which using no subsampling (4:4:4) provides a noticeable increase in the image quality; for example, when the image contains fine details such as text over a uniform background, or images with almost-flat colors.

  • 1x2,1x1,1x1 This is similar to (2x1,1x1,1x1), but the chroma sampling is in the horizontal direction rather than the vertical direction; as if someone rotated an image.

  • 2x2,1x1,1x1 (smallest file): Commonly referred to as (4:1:1), this produces the smallest files. This suits images with weak borders but tends to denature colors.

DCT metodas

DCT – tai diskretus kosinuso transformavimas, tai yra pirmas JPEG algoritmo žingsnis pereinant iš erdvinės srities į dažnių sritį. Galite pasirinkti iš slankaus kablelio skaičių, sveikųjų skaičių (numatytasis parametras) ir greitųjų sveikųjų skaičių.

  • float: The float method is very slightly more accurate than the integer method, but is much slower unless your machine has very fast floating-point hardware. Also note that the results of the floating-point method may vary slightly across machines, while the integer methods should give the same results everywhere.

  • iveikieji skaičiai (numatytasis): šis metodas greitesnis už slankaus kablelio skaičių , tačiau yra ne toks tikslus.

  • fast integer: The fast integer method is much less accurate than the other two.

1.2.4. Export Image as PNG

Pav. 6.5. The Export Image as PNG dialog

The „Export Image as PNG“ dialog


Checking interlace allows an image on a web page to be progressively displayed as it is downloaded. Progressive image display is useful with slow connection speeds, because you can stop an image that is of no interest; interlace is of less use today with our faster connection speeds.

Išsaugoti fono spalvą

If your image has many transparency levels, the Internet browsers that recognize only two levels, will use the background color of your Toolbox instead.

Išsaugoti gamą

Gamma correction is the ability to correct for differences in how computers interpret color values. This saves gamma information in the PNG that reflects the current Gamma factor for your display. Viewers on other computers can then compensate to ensure that the image is not too dark or too bright.

Išsaugoti sluoksnių poslinkį

PNG supports an offset value called the oFFs chunk, which provides position data. Unfortunately, PNG offset support in GIMP is broken, or at least is not compatible with other applications, and has been for a long time. Do not enable offsets, let GIMP flatten the layers before saving, and you will have no problems.

Išsaugoti raišką

Save the image resolution, in ppi (pixels per inch).

Išsaugoti sukūrimo laiką

Date the file was saved.

Išsaugoti komentarą

šį komentarą galite perskaityti Paveikslėlio savybės.

Išsaugoti spalvų reikšmes iš permatomų pikselių

When this option is checked, the color values are saved even if the pixels are completely transparent. But this is possible only with a single layer, not with a merged composition. When a multi-layer image gets exported to a single-layer file format, there is no way GIMP could preserve the color values in the transparent pixels.



Glaudinimo lygis

Since compression is not lossy, the only reason to use a compression level less than 9, is if it takes too long to compress a file on a slow computer. Nothing to fear from decompression: it is as quick whatever the compression level.

Keep metadata

If the image you loaded has Exif, XMP, IPTC metadata, they are preserved, and you can keep them or not when exporting to PNG.

Save Defaults

Click to save the current settings. Latter, you can use Load Defaults to load the saved settings.

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The PNG format supports indexed images. Using fewer colors, therefore, results in a smaller file; this is especially useful for creating web images; see Skyrius 6.6, „Indeksuota veiksena“.

Kompiuteriai naudoja 8 bitų blokus – baitus. Baitas leidžia 256 spalvas. Sumažinti spalvų skaičių mažiau 256 nenaudinga: vistiek bus naudojamas baitas, o failo dydis nebus mažesnis. Be to, šis PNG8 formatas, kaip ir GIF, permatomumui naudoja tik vieną bitą; galimi tik du permatomumo lygiai, permatomas arba nepermatomas.

1.2.5. Export Image as TIFF

Pav. 6.6. The TIFF Export dialog

The TIFF Export dialog


This option allows you to specify the algorithm used to compress the image.

  • None: is fast, and lossless, but the resulting file can be very large.

  • LZW: The image is compressed using the Lempel-Ziv-Welch algorithm, a lossless compression technique. This is efficient and fast. More information at [WKPD-LZW].

  • Pack Bits: is a fast, simple compression scheme for run-length encoding of data. Apple introduced the PackBits format with the release of MacPaint on the Macintosh computer. A PackBits data stream consists of packets of one byte of header followed by data. (Source: [WKPD-PACKBITS])

  • Deflate: is a lossless data compression algorithm that uses a combination of the LZ77 algorithm and Huffman coding. It is also used in Zip and Gzip files and PNG images. Source: [WKPD-DEFLATE].

  • JPEG: is a very good compression algorithm but lossy. This is the same compression as used in JPEG images. Since it is lossy, you should not use this when image quality is important. This compression can not be used when your image is in indexed mode.

  • CCITT Group 3 fax and CCITT Group 4 fax are black and white formats developed to transfer images by FAX.

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    These two compression modes can only be selected, if the image is in indexed mode and reduced to two colors. Use ImageModeIndexed to convert the image to indexed mode. Make sure that Use black and white (1-bit) palette is checked.

Save layers

Since GIMP-2.10.12, you can save layers when exporting to TIFF. Each layer will be a separate page in the TIFF image.

Crop layers to image bounds

When Save layers is checked, this option, which is enabled by default, will resize all layers to the size of the image. TIFF images can not have negative offsets. This option enables you to import the TIFF again without having to change the position of layers that had a different size as the image in the original.

Išsaugoti spalvų reikšmes iš permatomų pikselių

When this is enabled the color values are saved even if the pixels are completely transparent.


In this text box, you can enter a comment that is associated with the image.

Save Exif data

When this option is enabled existing EXIF metadata will be saved in the exported TIFF image.

Išsauogti XMP duomenis

When this option is enabled existing XMP metadata will be saved in the exported TIFF image.

Save IPTC data

When this option is enabled existing IPTC metadata will be saved in the exported TIFF image.

Save thumbnail

When this option is enabled a thumbnail will be saved as the second page in the exported TIFF image. This will also cause certain EXIF tags to be saved even if you have disabled saving EXIF metadata.

Save color profile

When this option is enabled the color profile will be saved in the exported TIFF image.

Save GeoTIFF data

When this option is enabled GeoTIFF metadata that was present in the original image will be saved in the exported TIFF image.

1.2.6. Export Image as MNG

Pav. 6.7. Export MNG File Dialog

Export MNG File Dialog

MNG is acronym for Multiple-Image Network Graphics.

The main problem is that Konqueror is the only Web navigator that recognizes the MNG animation format. Please see